Year	current US$
1970	2561.716875421033
1971	2923.6585069787807
1972	3554.264198072542
1973	4704.223712255924
1974	5435.491263836134
1975	6220.91155803545
1976	6788.336003896513
1977	7873.759204090231
1978	9520.870003654074
1979	10810.745531892606
1980	11501.440095393222
1981	9497.464231400916
1982	9145.36123934774
1983	8836.197871512146
1984	8295.564670816519
1985	8111.386181104447
1986	11317.881420821852
1987	13835.52051187706
1988	14596.239161648835
1989	14326.889931141195
1990	17198.460273878223
1991	17656.303221939605
1992	19305.401802869645
1993	18777.693026154375
1994	20271.8478771503
1995	24342.433899434607
1996	24320.397274627125
1997	22413.37005336139
1998	23160.033593154392
1999	23844.124513302355
2000	21979.629741479537
2001	21894.760302732117
2002	23744.07831920581
2003	29386.405683182784
2004	33160.50489134707
2005	34410.375700321965
2006	37261.55601732291
2007	42859.083277703605
2008	45441.87431430438
2009	41457.631379076345
2010	41485.07269013091
2011	44453.57418819673
2012	40527.215084131494
2013	42399.31394891187
2014	43058.08045613373
2015	36999.53244024066
2016	37170.14376385773
2017	40003.30181929814
2018	43940.04239627507
2019	42706.65912580097
2020	41293.75737445937
2021	46419.70712121187