Year	constant 2015 US$
1980	3080.9092872183223
1981	3394.7017252014566
1982	3258.2563975875746
1983	3213.909497420334
1984	3050.054105440154
1985	2578.6111211960338
1986	2763.1567201998423
1987	3076.4193171894735
1988	2806.523418532573
1989	2837.655439347443
1990	2903.7258886801155
1991	3085.2303729577648
1992	3130.1804269067616
1993	2975.38079316372
1994	2929.4793047380676
1995	3017.0167346445687
1996	2970.0852987222556
1997	3006.38103495207
1998	3048.444928678247
1999	2999.4803624341175
2000	3097.167700834622
2001	3046.9359649744647
2002	3189.521776423331
2003	3375.94516248441
2004	3627.524360864726
2005	3580.127370015903
2006	3813.512153711619
2007	3888.6645809763454
2008	3940.484489121636
2009	3886.155686803614
2010	3975.831677863657
2011	4158.799712475987
2012	4304.310242789014
2013	4636.736886254795
2014	4819.467837218539
2015	4957.7389939443965
2016	4780.495834084472
2017	4653.988504241552
2018	4529.324029426267
2019	4475.353517054038
2020	4133.700917466088
2021	4061.1775044675783
2022	4203.900412941501
2023	4272.009732466622