Year	constant 2015 US$
1991	10932.121626391558
1992	10113.499457837544
1993	9423.03028784784
1994	9147.931297125697
1995	9176.475005042677
1996	9074.58056343761
1997	9116.285953105626
1998	9180.567024754544
1999	8404.384935819711
2000	7718.634040909283
2001	9385.942413780389
2002	10158.933164898586
2003	10352.113683346226
2004	10760.09547493624
2005	10991.278499225331
2006	11199.193290268671
2007	11491.1532062513
2008	12264.550157040267
2009	12265.151968160671
2010	12239.051639397074
2011	12578.17602217711
2012	12583.150792386981
2013	12835.029664135911
2014	13043.02306075544
2015	13430.94892127227
2016	13633.351215073048
2017	14558.779549428202
2018	14319.891076646498
2019	15160.937571729413
2020	15344.226388478763
2021	14620.90688679541
2022	14620.14040191246