Year	constant 2015 US$
1991	9420.419790041951
1992	9394.482055793747
1993	9889.728368544318
1994	10715.97633506181
1995	12289.497422977995
1996	11837.49102427331
1997	11509.870061604119
1998	12166.396059072422
1999	12747.84821797648
2000	12705.984021349257
2001	13357.325046728056
2002	13290.421747406011
2003	13492.001523910547
2004	13460.64306255875
2005	16218.387540869917
2006	16315.16062613091
2007	17998.949315332506
2008	18022.09375655498
2009	13544.983874104646
2010	19396.559263970183
2011	19137.648861885635
2012	16970.77444439141
2013	19182.532128601903
2014	20026.03276710131
2015	22004.696530773585
2016	21294.12343802457
2017	22450.462309740073
2018	19085.108024542016
2019	23021.62906672334
2020	23165.6008583732
2021	20834.876995956143
2022	19537.15284846438