Year	constant 2015 US$
1995	15259.362009124596
1996	15602.428937856674
1997	16144.553645094811
1998	17015.079543945998
1999	17687.4471989301
2000	17793.515797586544
2001	18067.472254729644
2002	18298.01786256412
2003	18207.576422278566
2004	18432.518961610956
2005	18479.94123242111
2006	18480.54251186723
2007	18951.358574851274
2008	18709.623425403875
2009	18483.49978157848
2010	18704.512315713553
2011	18546.153293449628
2012	17764.81689786804
2013	18007.35868745435
2014	18208.023238449292
2015	18733.736728709573
2016	19344.390707126808
2017	20026.134515961523
2018	20563.032434540553
2019	21149.135269344846
2020	19718.69996206456
2021	20720.330238592076
2022	21515.06740613347
2023	22160.58836035084