Year	Millions of 2000 Dollars
1991-01-01	3569.52
1992-01-01	4393.24
1993-01-01	5203.16
1994-01-01	7544.91
1995-01-01	9607.00
1996-01-01	10275.80
1997-01-01	10442.00
1998-01-01	12975.00
1999-01-01	11919.30
2000-01-01	11834.60
2001-01-01	13717.60
2002-01-01	17122.80
2003-01-01	20844.10
2004-01-01	21150.10
2005-01-01	19113.40
2006-01-01	22480.00
2007-01-01	30952.20
2008-01-01	30981.50
2009-01-01	31755.60
2010-01-01	30140.40
2011-01-01	29208.70
2012-01-01	29142.50
2013-01-01	29913.80
2014-01-01	28125.20
2015-01-01	26363.80
2016-01-01	26785.90