Year	constant 2010 US$
1998	11588.0541279351
1999	12844.995116056
2000	13221.3312472803
2001	13139.4449156058
2002	12282.6784606491
2003	11016.3737245225
2004	10508.4978901775
2005	9287.44207505111
2006	8210.46203453935
2007	7788.84588020102
2008	7301.05087988653
2009	9147.57239691378
2010	11764.8408144408
2011	10460.8706876037
2012	9727.90752991854
2013	10113.6620715138
2014	9432.0064834066
2015	11859.3037978373
2016	12053.9567069911
2017	12619.4119517084
2018	13363.6420133076