Year Dollars 1992-01-01 501784 1997-01-01 1340717 2002-01-01 636501 2010-01-01 2046572 2011-01-01 3811938 2012-01-01 1876788 2013-01-01 6490882 2014-01-01 6473510 2015-01-01 4729305 2016-01-01 4927450