Year	constant 2015 US$
1991	8720.072694480263
1992	8573.938336323712
1993	8335.198672023278
1994	8304.166440401194
1995	8444.613692100658
1996	8705.88052506333
1997	9005.455464578361
1998	9126.312419911792
1999	9410.44449325926
2000	9763.498076718151
2001	10309.519175178855
2002	10632.449804993652
2003	10976.667574259849
2004	11324.279823585202
2005	11905.3327844064
2006	12651.760983539089
2007	13882.497021770505
2008	14567.539243289038
2009	14844.47852772057
2010	15670.588498183342
2011	16343.994780029308
2012	17110.316512518904
2013	17356.328461128574
2014	17599.50469308503
2015	18022.201820608003
2016	18688.041098910704
2017	19649.210549589945
2018	20596.833243736965
2019	21488.256576247113
2020	21881.879388525558
2021	22952.553710108208
2022	23150.764821336103