Year	current US$
2000	59.69736862
2001	55.38201141
2002	71.57524872
2003	81.08128357
2004	103.41331482
2005	120.18282318
2006	132.24249268
2007	146.50878906
2008	155.51965332
2009	170.96871948
2010	183.86772156
2011	210.11923218
2012	195.39874268
2013	245.2074585
2014	245.94456482
2015	238.09069824
2016	235.73020935
2017	218.37336731
2018	198.34815979
2019	240.10105896
2020	252.84034729
2021	263.88595581