Year	constant 2015 US$
1991	3750.403701483874
1992	3870.758758042073
1993	4070.2831131186545
1994	4197.73631728047
1995	4391.1871422073355
1996	4573.667646256091
1997	4682.385600318159
1998	3909.9724108234113
1999	3820.0222573289147
2000	3883.5693951566736
2001	4010.0970827768683
2002	4303.722171811607
2003	4643.129782308937
2004	4570.9359234586445
2005	5169.534266602946
2006	5159.233539099491
2007	5315.803648814434
2008	5547.360133771207
2009	5630.979838577091
2010	5796.4933621797145
2011	6042.483395226582
2012	6237.412875004308
2013	6433.098385047761
2014	6678.812372172383
2015	6890.898260595675
2016	6958.569313688972
2017	7063.916046367232
2018	7196.257801968658
2019	7286.113760748374
2020	7247.286137379341
2021	7512.354305911673
2022	7816.228564819236