Year	current US$
2000	23.407931995900864
2001	23.037912776819788
2002	22.318631417181948
2003	25.31054233330812
2004	29.475766643526388
2005	35.063973098658494
2006	41.61000309665238
2007	51.0181389329772
2008	63.44399105894295
2009	69.59932401833187
2010	80.6451895494196
2011	95.06816744367802
2012	102.54873403092857
2013	111.6975426494637
2014	117.73094031621005
2015	117.81346684236412
2016	115.25725492124434
2017	123.50867019615856
2018	129.2009206995233
2019	132.12843920145662
2020	136.5752472487574
2021	152.183268966357