Updated at 3:31 p.m. ET

Have you ever wondered how much your representative in Congress spends?

The non-partisan Sunlight Foundation has analyzed all the disbursement reports from individual members of the U.S. House and its committees and found that more than $1.36 billion was spent in 2010 -- most of it on salaries and benefits for staff.

The lawmaker who spent the most from his office account last year might surprise some people: Democrat Pedro Pierluisi, the non-voting delegate from Puerto Rico, topped the list and edged out Rep. Nancy Pelosi, D-Calif.

According to the analysis, Pierluisi spent more than $2.1 million to run his congressional offices in Washington and Puerto Rico. Most of it -- $1.2 million -- went to personnel costs. He spent about $174,000 on printing and about $60,000 on travel, according to the reports on the Sunlight Foundation's database.

Pierluisi's office attributes his high spending to the size of his constituency and Puerto Rico's distance from Washington.

"The resident commissioner of Puerto Rico is the sole representative in Congress of nearly 4 million constituents, which is five or six times as many as any other congressional district," Pierluisi's spokeswoman, Dennise Perez, writes in an e-mail to USA TODAY.

"Given Puerto Rico's lack of a full congressional delegation, our office must work closely with state and local government officials to ensure that Puerto Rico is also well represented before the federal agencies," the e-mail said.

Pelosi spent about $1.9 million to run her congressional district offices, according to the analysis. The total does not include what she spent last year as House speaker.

Each lawmaker is given an allowance to run his or her congressional office, but the amounts vary to account for such things as the distance between a member's district and Washington office and the cost of office space. The Congressional Research Service says the average office allowance for a House member in 2010 was about $1.5 million.

For Pierluisi, traveling by air to Puerto Rico is his only option and his office notes that the cost fluctuates throughout the year. As for his printing and production costs, Pierluisi's office says he prints and distributes a newsletter to about 2 million people at least three times a year.

Sunlight's analysis comes a few months after the House pushed through a plan by Speaker John Boehner to cut all budgets of Congress -- for individuals, committees and leadership offices -- by 5%. That resulted in savings of about $35 million.

The other top five spenders in the House, according to Sunlight, were Rep. Jim Costa, D-Calif., and former lawmakers Dina Titus, D-Nev., and Scott Murphy, D-N.Y. Titus and Murphy were defeated for re-election in November.