Year	Millions of 2000 Dollars
1997-01-01	3429.53
1998-01-01	2645.27
1999-01-01	2785.31
2000-01-01	1297.18
2001-01-01	2296.54
2002-01-01	3931.33
2003-01-01	5326.83
2004-01-01	6418.78
2005-01-01	7076.39
2006-01-01	11489.80
2007-01-01	17555.80
2008-01-01	16451.40
2009-01-01	18337.00
2010-01-01	17164.20
2011-01-01	18020.70
2012-01-01	18186.80
2013-01-01	19424.20
2014-01-01	17506.30
2015-01-01	16656.00