Year	constant 2015 US$
1970	1103.8223755909285
1971	1180.6050992626924
1972	1396.2781280692589
1973	1091.5263128185886
1974	1558.080780881247
1975	1602.1058501761308
1976	1639.0217369314555
1977	1806.9440300307187
1978	1890.2874518807037
1979	1793.5994408338406
1980	1910.264739391169
1981	1900.8182868010194
1982	1706.9585550094494
1983	1615.537834864463
1984	1329.1706392327726
1985	1739.5284191520366
1986	1558.1827173616173
1987	1942.6673450876076
1988	2204.6378238489074
1989	1782.6078250229825
1990	1671.387325807711
1991	1637.0228019467756
1992	1867.6453348437776
1993	1882.5659281629544
1994	1778.7061685406018
1995	1870.0525892980884
1996	1930.2621853486255
1997	1899.014483733159
1998	1959.2704934820692
1999	1823.7043869897377
2000	1729.1329256068832
2001	1597.1294268981426
2002	1661.0733557421306
2003	1800.851617733833
2004	1941.8963762048927
2005	2277.75132870267
2006	1903.4309153413692
2007	2029.1326070678242
2008	2241.6283676987696
2009	2144.3585862534437
2010	2163.0791581745702
2011	2379.539771955407
2012	1878.589711974878
2013	1274.6498143936076
2014	1142.058996213048
2015	795.8289073949923
2016	819.2204435150741
2017	525.7271419410343
2018	316.51129739987044
2019	421.6842955812747
2020	236.72573544672923
2021	287.36905448033275