Customs and Border Protection apprehended nearly 416,000 people at the Southern U.S. border from January-November 2018 – the most in any 11-month period since 2014, according to a new analysis of government data.

Despite the spike, border apprehensions remain significantly lower than the rates of the 1980s, 1990s and 2000s, according to a Pew Research Center report using Customs and Border Protection data. Roughly 1 million migrants were captured each fiscal year during those decades.

Families accounted for about a third of the overall increase in 2018, as the number of family units captured rose to 25,172 in November 2018, up from 7,016 in November 2017 – a 259 percent increase, year-on-year.

Overall, nearly 136,000 family members were apprehended from January-November last year – a three-fold increase compared to the same period in 2017.

It represents the highest number of family captures since at least 2012.

This chart illustrates a major uptick in family apprehensions at the Southern U.S. border in the first 11 months of 2018 compared to the same period in 2017

The new data comes as the government enters its third week of a partial federal government shutdown, and as President Trump and Democratic leaders in Congress face a stalemate over whether to build a $5.7 billion wall along the U.S.-Mexico border.

Trump issued a presidential address to the American people on Tuesday night, in which he asked 'how much more American blood must we shed' by immigrants before Democrats in Congress would agree to build a wall.

In their joint response, Democratic Speaker of the House Nancy Pelosi and Senate Minority Leader Chuck Schumer accused Trump of leveraging fear over facts in an effort to keep a campaign promise.

'The fact is: the women and children at the border are not a security threat, they are a humanitarian challenge – a challenge that President Trump's own cruel and counterproductive policies have only deepened,' Pelosi said.

A massive proportion of the family apprehensions at the Southern border came in the final months leading up to the shutdown, with families accounting for 49 percent of the total captures in November.

Data for December will not be available until the government shutdown comes to an end.

This chart illustrates the year-on-year increase in overall Southern U.S. border apprehensions between 2017-2018

In addition, border agents captured roughly 49,000 unaccompanied children from January-November, accounting for 12 percent of all apprehensions.

'Other' apprehensions (non-family and non-unaccompanied minors) accounted for 56 percent, or more than 231,000 of the total captures.

Unlike years past, the vast majority of immigrants coming into the U.S. across the Southern U.S. border are from Mexico or from Central America's Northern Triangle – El Salvador, Guatemala and Honduras.

However, the number of Mexicans crossing has decreased significantly over the past decade. At the same time, those fleeing violence and gangs in the Northern Triangle has risen.

El Salvador had the world's highest murder rate in 2016 (82.8 homicides per 10,000 people), followed by Honduras (56.5), while Guatemala ranked tenth (27.3), according to the United Nations Office on Drugs and Crime.