Year Dollars 1992-01-01 1252229 2008-01-01 3111949 2010-01-01 5104808 2011-01-01 3742025 2012-01-01 4818801 2013-01-01 2597540 2014-01-01 5157142 2015-01-01 8602862 2016-01-01 2853900