Year	Millions of 2011 U.S. Dollars
1960-01-01	7208
1961-01-01	7795
1962-01-01	8349
1963-01-01	9181
1964-01-01	8841
1965-01-01	9512
1966-01-01	10545
1967-01-01	11839
1968-01-01	13449
1969-01-01	15290
1970-01-01	17398
1971-01-01	19494
1972-01-01	22127
1973-01-01	24583
1974-01-01	26176
1975-01-01	27390
1976-01-01	29417
1977-01-01	31612
1978-01-01	34355
1979-01-01	37583
1980-01-01	41359
1981-01-01	45795
1982-01-01	49086
1983-01-01	53291
1984-01-01	57994
1985-01-01	57617
1986-01-01	58359
1987-01-01	64645
1988-01-01	71804
1989-01-01	79148
1990-01-01	87147
1991-01-01	92799
1992-01-01	99324
1993-01-01	110726
1994-01-01	122435
1995-01-01	131347
1996-01-01	141364
1997-01-01	153390
1998-01-01	150061
1999-01-01	159360
2000-01-01	173771
2001-01-01	171765
2002-01-01	178983
2003-01-01	187181
2004-01-01	204325
2005-01-01	219384
2006-01-01	238610
2007-01-01	259744
2008-01-01	264162
2009-01-01	261574
2010-01-01	300191
2011-01-01	314867