Year	constant 2015 US$
1970	2606.71969100275
1971	2781.532090715684
1972	2870.1301865968367
1973	2927.6330202186423
1974	2920.279434504664
1975	3163.0121109928346
1976	3304.635028543899
1977	3565.828363980393
1978	3778.5913488100928
1979	3802.2319523256474
1980	3605.1587747529597
1981	4297.6689250903055
1982	4652.452846486041
1983	4867.028388469669
1984	5210.725069966126
1985	5250.365687707014
1986	5210.989218488017
1987	5040.78468175497
1988	5178.171072438785
1989	5162.995233705737
1990	4963.847382509011
1991	4397.025412309594
1992	3862.609593785072
1993	3270.579739929971
1994	3280.0271833213087
1995	3348.47663366952
1996	3598.989780797381
1997	3687.359929780721
1998	3681.302450362802
1999	3896.298093547238
2000	4113.490275352697
2001	4231.8036620339835
2002	4280.216733408903
2003	4430.984539028489
2004	4675.788771894558
2005	5189.92860406232
2006	5808.640734572276
2007	6225.354517850598
2008	6477.777944053039
2009	6567.960154703458
2010	6720.649915173286
2011	6903.911705419872
2012	7105.4043292251035
2013	7292.708134110349
2014	7362.311259200518
2015	7683.740253656692
2016	7721.703569780277
2017	7865.3386087538465
2018	8047.941030646161
2019	8043.014197265107
2020	7172.517927676566
2021	7291.037771621701
2022	7449.68287994077