Year	constant 2015 US$
1965	2687.100646862145
1966	2763.0624254701816
1967	4485.649330015693
1968	7962.525568816149
1969	9757.972124745213
1970	10830.492810857208
1971	10640.462088121552
1972	11368.332223799784
1973	9473.139758876516
1974	10197.436343223157
1975	12164.85938012761
1976	14007.176372006677
1977	13461.480811236708
1978	12302.022796008872
1979	12160.747563909566
1980	12208.932351667761
1981	13517.487587282401
1982	14251.02644981705
1983	15710.783203924251
1984	17347.275796364243
1985	18608.260859483347
1986	17795.29383779202
1987	16175.505224290522
1988	16189.130449852566
1989	17138.08618509897
1990	16255.585866161427
1991	16418.084459613972
1992	16992.187264658674
1993	17265.50241518557
1994	17415.153557810434
1995	17957.155909569137
1996	18191.922018432637
1997	18983.473271942672
1998	19193.290967294677
1999	18983.183888444153
2000	19953.675180485156
2001	20581.263606094053
2002	20109.054556373056
2003	19347.52351608532
2004	19301.806710568777
2005	19418.015047080247
2006	20097.900402507585
2007	20629.84337423357
2008	21939.84744415235
2009	22879.505159521395
2010	21782.799384955397
2011	20142.15705237891
2012	19888.753861743473
2013	19387.08276915618
2014	18694.310951892352
2015	18777.43305891617
2016	18799.808451388017
2017	18260.005074703982
2018	18256.653145330063
2019	18044.27045350075
2020	17662.242841681953
2021	18300.76199537576
2022	18856.875237347755
2023	18821.9818345292