Year	constant 2010 US$
2007	3211.73601929363
2008	3365.40055644794
2009	3284.52330019312
2010	3229.74566731602
2011	3334.11628052408
2012	3316.43236899134
2013	3326.58404093544
2014	3253.07007966333
2015	3287.94741281455
2016	3405.37681893525
2017	3505.05510221258
2018	3703.89030026791