Year	current US$
1971	345.87254352194134
1972	409.31404673154486
1973	461.1103631166872
1974	558.4068844730488
1975	670.9857678752493
1976	717.936932618458
1977	800.5676013572449
1978	831.0622206894185
1979	940.6902551738596
1980	1056.9469771379236
1981	1124.518701053873
1982	1219.5845432737638
1983	1286.0418478841436
1984	1505.394779505634
1985	699.9161995610301
1986	855.2296145086535
1987	785.9917663342109
1988	695.8051112388708
1989	863.1905672098542
1990	901.3216491911171
1991	1232.6039205726215
1992	1442.935510570487
1993	1556.1904672428886
1994	1727.3225580482044
1995	1911.4527462167744
1996	2088.2302800969856
1997	2268.265143308737
1998	2432.5303804053815
1999	2428.172303700477
2000	2616.8447786335832
2001	2732.0505187708673
2002	2844.773044512951
2003	2105.626786494563
2004	2113.7561023463786
2005	3496.3409051084327
2006	3651.6210183982885
2007	4163.790028806985
2008	4659.26933291528
2009	4617.547445704645
2010	5070.496318864333
2011	5373.686104230111
2012	5540.401383495469
2013	5557.481113508921
2014	5870.815011507058
2015	6231.531887458956
2016	6515.928627924335
2017	6739.9627385768845
2018	7124.26632944963
2019	7278.316822226937
2020	6318.713366908335
2021	7367.810180354417