Year	constant 2015 US$
1970	14125.512609112759
1971	14414.115918158825
1972	15029.106008294906
1973	15716.387630183586
1974	15221.273598632333
1975	15118.25528905304
1976	15672.56846875771
1977	16032.124125120401
1978	16650.450908637773
1979	16760.416177451007
1980	16526.57857012711
1981	16704.853399432177
1982	16724.541373860917
1983	16953.746675888997
1984	17684.009393958473
1985	18226.951889280146
1986	18820.527109838844
1987	19366.2277644958
1988	20238.445903035503
1989	20704.690648451196
1990	21066.481617878046
1991	21179.15389229298
1992	21443.141652057635
1993	21454.734697564654
1994	22108.369742486982
1995	22558.35097874557
1996	23115.9748333088
1997	23860.69074810272
1998	24542.41707597859
1999	25135.644718957108
2000	25832.458432593776
2001	26061.79876027622
2002	26205.27721691856
2003	26461.441305558215
2004	27141.25284636634
2005	27572.232798252888
2006	28239.710601423565
2007	28496.630823202475
2008	27693.785514132862
2009	26783.608389012436
2010	27655.43280259772
2011	27916.65826673377
2012	28239.397860233606
2013	28466.67237368731
2014	29035.640587593854
2015	29775.853120553467
2016	30091.991683196935
2017	30695.77513144364
2018	31122.479245811242
2019	31467.576837701425
2020	29709.265027434853
2021	31091.059982132305