The plan to grow the size of the Chicago Police Department could mean hiring more than 2,200 police officers over the next two years.

In a string of September announcements, Mayor Rahm Emanuel and Chicago Police Superintendent Eddie Johnson laid out a series of police staffing proposals which, according to Johnson, would staff the department to a budgeted 13,500 sworn members. There are three main parts to the plan:

1. Add 500 new officers.

2. Promote 470 officers to higher ranks and other positions and hire new officers to fill those empty spots.

3. Fill the department’s current vacancies, which as of Oct. 16 were 471.

GROWING THE FORCE CPD hiring by category 402 have said they want to retire by end of 2017 ... ... and an average number of retirements in 2018 would add more openings CPD said it will hire to fill open positions Emanuel announced the hiring of new officers ... ... and promotion of others while hiring behind them 2,243 New officers needed through 2018 to maintain a larger police force 500 470 402 400 471 These hires would increase CPD from its current size of 12,100 members to 13,500. These hires would be necessary to maintain a size of 13,500. Growing the force CPD hiring by category CPD said it will hire to fill open positions 471 Emanuel announced the hiring of new officers ... 500 ... and promotion of others while hiring behind them 470 These hires would increase CPD from its current size of 12,100 members to 13,500. 402 have said they want to retire by end of 2017 ... 402 ... and an average number of retirements in 2018 would add more openings 400 These hires would be necessary to maintain a size of 13,500.

That would grow the department by 1,400 new cops; however, to sustain that new level, the hires will have to come on top of as many as 800 retirements over the next two years, a number that could be much larger by some estimates.

As of the beginning of October, 402 officers put in for retirement between now and the end of 2017, CPD spokesman Frank Giancamilli said. Estimates from the CPD’s data department and the police union point to the possibility of considerably more.

OFFICERS COMING AND GOING Officers hired Officers leaving 50 2011 451 451 2012 535 585 2013 336 314 2014 319 443 2015 372 418 2016 370 Source: Chicago Police Department OFFICERS COMING AND GOING Officers hired Officers leaving 50 2011 451 451 2012 535 585 2013 336 314 2014 319 443 2015 372 418 2016 370 Source: Chicago Police Department

There is no indication yet of how many officers will retire between 2017 and 2018 but the department’s average over the past five years is about 400 each year.

That's another 800 officers that will need to be hired on top of the proposed amount, in the same two-year time frame, bringing the total number of hires needed to more than 2,200.

Hiring for 2017 is still being ironed out, Giancamilli wrote in an email, but he said the department plans to hire and train 1,100 new officers, adding roughly 100 officers per month. That pace would need to continue for a second year to keep up with retirements.

SIZE OF CPD BY YEAR Size as of October: 12,100 12,000 12,000 9,000 9,000 6,000 6,000 3,000 3,000 2010 2013 2016 2000 2003 2006 2009 Source: CPD annual reports, measured each December Source: Freedom of Information request, measured each January SIZE OF CPD BY YEAR Size as of October: 12,100 12,000 12,000 9,000 9,000 6,000 6,000 3,000 3,000 2000 2003 2006 2009 2010 2013 2016 Source: Freedom of Information request, measured each January Source: CPD annual reports, measured each December SIZE OF CPD BY YEAR 12,000 9,000 6,000 3,000 2000 2003 2006 2009 Source: CPD annual reports, measured each December Size as of October: 12,100 12,000 9,000 6,000 3,000 2010 2013 2016 Source: Freedom of Information request, measured each January

Since 2011, the department has grown slightly, hiring just enough officers to grow the overall size of the force by a little more than 200. Prior to that, numbers declined between 2009 and 2012 when hiring didn't keep up with a flood of about 2,600 departures . The overall size of the department dropped by about 900 during that time.

WHO IS ELIGIBLE TO RETIRE? Each shape represents the group of officers who fall within the range of age and service spanned by the hexagon. Fewer officers More officers 1,472: Officers with contractual incentives to retire 60 55 50 45 AGE 943: 40 Officers who have worked 26 years, average years of service 35 30 25 20 0 10 20 30 40 YEARS OF SERVICE Pension fund data included individual officers’ time served and year of birth. All officers were active in the force as of Dec. 31, 2015, the most recent date the fund retrieved the numbers. Source: Policemen's Annuity and Benefit Fund Who is eligible to retire? Each shape represents the group of officers who fall within the range of age and service spanned by the hexagon. Fewer officers More officers 1,472: Years of service vs age Officers with contractual incentives to retire 60 55 50 45 943: 40 Officers who have worked 26 years, average years of service 35 30 25 20 0 10 20 30 40 Pension fund data included individual officers’ time served and year of birth. All officers were active in the force as of Dec. 31, 2015, the most recent date the fund retrieved the numbers. Source: Policemen's Annuity and Benefit Fund

A Tribune analysis of police pension fund data shows a large number of officers eligible for sweetened retirement benefits, an incentive known as “55 and out,” as part of their contract, which expires in June 30, 2017.

There are 569 officers who have served for at least 26 years, the average time for retirees between 2011 and 2015, and are at least 55 years old. Officers 55 or older qualify for extended health care benefits, extending coverage, paid for by the department, until an officer is eligible for Medicare.

There are 3,840 officers who have served for at least 20 years, at which point, pension benefits grow by about $2,000 each month, the pension fund estimates. Of eligible officers, 2,592 officers are older than 50, when their pensions start to be paid.