Year	constant 2015 US$
1991	6089.859907866475
1992	6319.081778083935
1993	6532.46850909973
1994	6815.272694924382
1995	6952.958034339821
1996	7150.853826667097
1997	7301.016314537977
1998	7497.360904680026
1999	7641.755603131569
2000	7807.470544541901
2001	7960.629375413481
2002	7534.469590023783
2003	7509.306402908405
2004	7714.620551831425
2005	7683.653969184604
2006	8004.028268761013
2007	8120.783436178468
2008	8440.109181331076
2009	8680.565586344159
2010	8919.83740865622
2011	8983.839769427885
2012	9111.85348060127
2013	9242.594506882979
2014	9498.67317507616
2015	9700.127833200138
2016	9468.643520648335
2017	9781.86259225797
2018	10223.918443501516
2019	10454.46164275289
2020	10221.26075308388
2021	10189.487897246638
2022	10066.770927469439