Year	constant 2015 US$
1990	520.642944335938
1991	520.137084960938
1992	509.255493164063
1993	500.691040039063
1994	490.834167480469
1995	495.677459716797
1996	514.354248046875
1997	519.238220214844
1998	527.594177246094
1999	536.630981445313
2000	547.459533691406
2001	557.014404296875
2002	591.195556640625
2003	610.84326171875
2004	638.894775390625
2005	664.055053710938
2006	699.960327148438
2007	718.160705566406
2008	739.83349609375
2009	760.537109375
2010	781.089416503906
2011	817.059692382813
2012	833.185241699219
2013	862.255004882813
2014	896.158081054688
2015	915.490173339844
2016	940.961730957031
2017	973.371215820313
2018	1001.33355712891
2019	1023.001953125
2020	1008.85229492188
2021	1023.86010742188
2022	1039.39624023438