Year	current US$
2000	2161.85302734
2001	2192.71557617
2002	2449.75830078
2003	3006.3059082
2004	3458.62744141
2005	3575.02514648
2006	3811.55175781
2007	4312.31054688
2008	4807.37451172
2009	4737.578125
2010	4592.38330078
2011	4931.87792969
2012	4644.59570313
2013	4884.76660156
2014	4980.81494141
2015	4201.78173828
2016	4256.765625
2017	4410.59912109
2018	4666.97998047
2019	4504.48486328
2020	4755.44042969
2021	5380.875