Year	constant 2015 US$
1991	24492.757741659556
1992	21162.507129610203
1993	21303.672673183097
1994	21328.038992807684
1995	24589.578372280706
1996	22849.34203517168
1997	26046.096398209105
1998	24576.46007699388
1999	19646.41074206172
2000	20502.76182006365
2001	20282.293174250208
2002	25821.002617819267
2003	35175.54354741107
2004	21618.042269169644
2005	24410.821025370686
2006	29335.391478845202
2007	29482.72518738535
2008	23619.09395173369
2009	26277.38385696725
2010	23082.432125654454
2011	18513.750184031007
2012	18866.796209680862
2013	15826.385802240233
2014	14437.386060675068
2015	14235.210848497089
2016	15165.962105116088
2017	14082.213764759768
2018	12476.755784682642
2019	9795.327645421341
2020	12657.41250596323
2021	8129.690079560794
2022	7911.455689423272