Year	constant 2015 US$
1991	38327.58940204234
1992	38263.055541338596
1993	37892.80216730347
1994	38328.83014965564
1995	39623.01495467665
1996	42007.557007192096
1997	45485.168092721826
1998	49624.38567147382
1999	54486.88554321545
2000	55672.86785422382
2001	58257.34794854347
2002	60951.72875969089
2003	64042.49576420944
2004	66867.62350552835
2005	70022.26053028236
2006	74511.13249010405
2007	79385.64527825585
2008	73884.6978338263
2009	73066.67754061696
2010	73499.48655874528
2011	74870.7517894019
2012	78475.15730311541
2013	82686.70425623751
2014	84188.41971959105
2015	81663.49178041445
2016	80974.4991081097
2017	85025.10583197985
2018	90251.48374316347
2019	90624.78011666061
2020	84758.72701862064
2021	77330.10671143085