By the numbers: Border buildup

Agents: 

18,415 Border Patrol agents on the U.S.-Mexico border today.

3,555 Border Patrol agents on the U.S.-Mexico border in 1992.

Barriers: 

649 miles of border fences and vehicle barriers on the U.S.-Mexico border today.

143 miles of border fences and vehicle barriers on the U.S.-Mexico border in 2006.

Budget: 

$11.4 billion budget for Customs and Border Protection, the Department of Homeland Security agency responsible for border security, in fiscal year 2010

$6 billion budget for Customs and Border Protection fiscal year 2004