Year	current US$
2000	13.736022908489836
2001	14.725091465379567
2002	14.834089113752505
2003	16.637517436912336
2004	18.27975176829024
2005	20.761944748694617
2006	23.006449928683054
2007	26.55706942526427
2008	29.302934761720937
2009	28.568284554130305
2010	32.24974510185345
2011	34.47013236775595
2012	36.52045647026981
2013	41.138745795199576
2014	41.65850276531549
2015	41.99137637452522
2016	41.22728343015906
2017	37.100257613038515
2018	37.80363547858396
2019	39.21071664914373
2020	39.24924838345302
2021	44.70254611253437