Year	constant 2015 US$
1991	29956.543410742932
1992	30157.146842530827
1993	31965.47637138197
1994	32776.19548399331
1995	34351.457811634784
1996	35013.4709401314
1997	39153.80510389256
1998	40930.57867325418
1999	45301.92538525046
2000	48368.763604960026
2001	51628.33247743289
2002	52808.295055000905
2003	57043.486422646005
2004	62107.56266280121
2005	61273.97635964357
2006	53961.41356770266
2007	50500.644415218805
2008	51258.063535515124
2009	53431.08001024073
2010	49290.05116509214
2011	47262.419773688955
2012	50432.35060329698
2013	49829.350886757165
2014	51559.12186565682
2015	55382.842802700565
2016	53647.836783515784
2017	53185.91107188662
2018	63035.94411303153
2019	33187.21469489625
2020	55768.20683192637
2021	59499.08022093094
2022	57007.64025822258