Year	constant 2015 US$
1970	5633.349872962452
1971	5752.682010428397
1972	6171.123206328656
1973	6424.203215860025
1974	6711.270495948224
1975	6558.857314553684
1976	6729.180102511758
1977	6913.748150593184
1978	7345.106315777376
1979	7731.546647488781
1980	7270.8240236346355
1981	8056.549426739471
1982	8553.96148312481
1983	9132.086740889661
1984	8395.53516345812
1985	8354.71392679941
1986	9467.732794940901
1987	10145.447032498932
1988	10445.758674410426
1989	10326.475411334393
1990	10609.368244244873
1991	10714.012033846835
1992	11134.683601716057
1993	11623.860281235973
1994	12409.476035671478
1995	13102.530337850761
1996	13517.596571399286
1997	13714.46136069359
1998	14181.06835152692
1999	14414.681570171075
2000	15204.012164556292
2001	15428.405381455203
2002	15355.79279771952
2003	15118.565514801667
2004	15629.624232888977
2005	15883.115824954522
2006	16411.791778296036
2007	17330.28176841279
2008	17393.394876715316
2009	17161.95760497179
2010	17664.761612127717
2011	18084.226789385782
2012	18226.785376527925
2013	18475.321018568557
2014	18840.69205219738
2015	19151.058449765962
2016	19930.254181124987
2017	20241.80140846074
2018	20563.47086562667
2019	20983.18807478729
2020	19090.391334427637
2021	20923.987300296183
2022	22037.400825021883
2023	21429.232829088767