Year	constant 2015 US$
1987	3459.3216429942813
1988	3523.216949520737
1989	3525.6623911565007
1990	3581.701707872995
1991	3377.7281290474575
1992	3190.1391468620786
1993	3103.989820627371
1994	2781.1440562579014
1995	2798.7851032395097
1996	2895.346922576916
1997	3042.5003105522933
1998	3102.3952623222976
1999	3059.014214445669
2000	3254.969394530106
2001	3237.2948602671727
2002	3429.8716869338728
2003	3640.056243056556
2004	3971.117808129735
2005	4285.117182094026
2006	4612.782977775772
2007	4917.69469281513
2008	5032.071223637032
2009	4819.27250925119
2010	5111.145480149612
2011	5497.996373252439
2012	5675.738042059507
2013	5998.6586643955125
2014	6148.364157386551
2015	6312.150341670412
2016	6430.659516818359
2017	6748.182042595501
2018	6926.95089041506
2019	7021.206857372006
2020	6995.155723823932
2021	7571.51514115903
2022	7922.981797170301
2023	8269.253269538642