Year	constant 2015 US$
1991	13738.245259898342
1992	13750.36010561473
1993	13763.285358844803
1994	13519.600217136376
1995	13305.386522028744
1996	13363.86239926889
1997	14481.913052382082
1998	16083.443533650494
1999	17287.242434373526
2000	17165.879623112236
2001	17672.215030181986
2002	17336.417191026485
2003	17499.44171549495
2004	21615.336335932614
2005	19431.745340714042
2006	18862.53629076125
2007	19098.683320902797
2008	20387.768392602233
2009	18688.94133592639
2010	18029.700723607057
2011	22447.949478304967
2012	21809.442038695146
2013	21514.81748504307
2014	20872.8305930899
2015	22516.689180355646
2016	23619.753536440698
2017	27190.615191386576
2018	29320.07911436227
2019	28433.73744876385
2020	25144.389787215612
2021	27756.19908248019
2022	30278.97212978875