Year	Millions of 2000 Dollars
1991-01-01	1050.580
1992-01-01	504.027
1993-01-01	162.128
1994-01-01	272.097
1995-01-01	307.647
1996-01-01	238.317
1997-01-01	284.188
1998-01-01	247.959
1999-01-01	267.376
2000-01-01	297.193
2001-01-01	372.610
2002-01-01	506.285
2003-01-01	716.078
2004-01-01	806.368
2005-01-01	1059.710
2006-01-01	1416.920
2007-01-01	2123.740
2008-01-01	1827.950
2009-01-01	2025.520
2010-01-01	3723.670
2011-01-01	4459.220
2012-01-01	5219.710
2013-01-01	5374.510
2014-01-01	5264.270
2015-01-01	4665.390
2016-01-01	4433.700