Year	constant 2010 US$
1991	9597.7602664269
1992	10064.578486286
1993	10960.8403194583
1994	12075.8724715829
1995	12803.3602743526
1996	13642.6865632936
1997	14326.9228096681
1998	14408.8260148846
1999	14934.1281742283
2000	13792.6861707396
2001	14312.1003619309
2002	15332.7248322862
2003	16056.365600442
2004	14694.2735278032
2005	14354.4341236605
2006	15049.0045896662
2007	15954.4193287179
2008	16862.7571863579
2009	17185.7973699687
2010	19395.4661203881
2011	19398.9158174013
2012	19226.0243088718
2013	20022.1524231402
2014	20936.26538141
2015	20648.9084591978
2016	21431.8465992444
2017	21748.0522932729
2018	21922.0768226746