Year	Millions of 2011 U.S. Dollars
1960-01-01	3206354
1961-01-01	3281057
1962-01-01	3479888
1963-01-01	3632016
1964-01-01	3842183
1965-01-01	4088852
1966-01-01	4355358
1967-01-01	4465430
1968-01-01	4681605
1969-01-01	4827044
1970-01-01	4836226
1971-01-01	4998556
1972-01-01	5264156
1973-01-01	5569091
1974-01-01	5538371
1975-01-01	5526695
1976-01-01	5823128
1977-01-01	6090882
1978-01-01	6430618
1979-01-01	6631603
1980-01-01	6613352
1981-01-01	6781237
1982-01-01	6649514
1983-01-01	6949915
1984-01-01	7449373
1985-01-01	7757596
1986-01-01	8026370
1987-01-01	8283127
1988-01-01	8623657
1989-01-01	8931766
1990-01-01	9099424
1991-01-01	9078113
1992-01-01	9386109
1993-01-01	9653862
1994-01-01	10047104
1995-01-01	10299780
1996-01-01	10684974
1997-01-01	11161194
1998-01-01	11647276
1999-01-01	12209536
2000-01-01	12714776
2001-01-01	12852054
2002-01-01	13085119
2003-01-01	13417601
2004-01-01	13882939
2005-01-01	14309281
2006-01-01	14689600
2007-01-01	14970616
2008-01-01	14920172
2009-01-01	14462202
2010-01-01	14808060
2011-01-01	15075700