Year	current US$
2000	15.44572674
2001	17.2049503
2002	17.9304242
2003	17.17439388
2004	18.70302976
2005	22.02796262
2006	21.32473995
2007	15.44172959
2008	33.44143561
2009	37.73547259
2010	35.91170703
2011	47.44561979
2012	42.2661816
2013	44.20659153
2014	43.26087221
2015	42.0138576
2016	46.42222435
2017	50.89772786
2018	61.95926398
2019	79.20947305
2020	74.81811411
2021	72.26214791