Year	current US$
1970	788.8913188560591
1971	954.3333973310636
1972	1036.6535867242342
1973	1396.6197307770433
1974	1272.0009998557016
1975	541.4709876546589
1976	741.6890784143019
1977	1041.5226975214728
1978	1182.3360705109149
1979	1593.2839148907085
1980	2109.197928819447
1981	2490.882547509485
1982	1683.178184963203
1983	1272.3082831444344
1984	1185.6129441297235
1985	968.8848034435937
1986	1064.2562560301799
1987	1275.8660704766949
1988	1451.633622782647
1989	1637.8682909681895
1990	1853.0890358049107
1991	2181.0481217532883
1992	2680.842107655008
1993	2886.287637883253
1994	3221.928779206215
1995	4097.932520470998
1996	4357.17789822961
1997	4728.67247515905
1998	4583.06318870632
1999	4067.053865635905
2000	4103.771597939596
2001	3767.445648337275
2002	3658.1269569498827
2003	3831.864108452031
2004	4580.736699116767
2005	5570.932213927411
2006	6243.95229609145
2007	7053.87734548767
2008	7731.672622204282
2009	7671.38433055761
2010	9546.465845009358
2011	10604.980164108772
2012	11887.515929723959
2013	12514.969408972625
2014	11688.278247218426
2015	11281.813072500001
2016	11133.06338571553
2017	11819.49187743019
2018	12167.308445824681
2019	11556.47033927882
2020	9756.161448243254
2021	11095.880284012761