Year	constant 2015 US$
1993	5884.617334528449
1994	6084.360241496831
1995	5934.050226171912
1996	5864.86342041232
1997	6066.286676606978
1998	6418.064973751905
1999	6534.421115845682
2000	6823.574029658447
2001	7230.600978425593
2002	7821.99956939438
2003	8213.876054898385
2004	8710.569822071388
2005	8996.399029848753
2006	9241.15969936808
2007	9128.781208607757
2008	9263.469046103539
2009	8712.81120093949
2010	8785.69664999834
2011	8846.833455393662
2012	8734.666492504728
2013	9162.147493257782
2014	9540.561553109475
2015	9983.018368321831
2016	10544.833094287944
2017	10824.898735585315
2018	11393.583917599854
2019	12149.233910153976
2020	11631.086688653164
2021	12021.412109029545