Year	constant 2015 US$
1989	5477.557664223122
1990	5364.707557228194
1991	5020.349609573012
1992	4523.457128424482
1993	4299.643719039944
1994	3928.907451676279
1995	3918.57493077101
1996	3952.461262623572
1997	4063.388235353006
1998	4034.7884535108756
1999	4135.271187338723
2000	4443.473204769148
2001	4562.688352213993
2002	4795.143039191021
2003	5090.71177145087
2004	5487.514855525412
2005	5847.001600476188
2006	6298.687253077526
2007	6773.8985844051085
2008	7057.168683576424
2009	6701.867883046581
2010	6981.591559735817
2011	7358.959398550056
2012	7578.377510800471
2013	7796.028027988389
2014	7937.909331976986
2015	8014.504150794851
2016	8121.813057228633
2017	8431.583806668456
2018	8705.98998253335
2019	8898.258889518765
2020	8743.867577475554
2021	9374.897891147199
2022	9659.416942138449
2023	9992.535004022971