Year	current US$
2000	328.68823576
2001	376.97230081
2002	419.63909399
2003	832.53123724
2004	940.45511462
2005	1009.78779949
2006	989.01079904
2007	954.60321652
2008	953.78111887
2009	927.08237126
2010	927.50652136
2011	1094.22844222
2012	1356.48537986
2013	1706.14404047
2014	1957.27367395
2015	2140.18200854
2016	1780.85640953
2017	1611.44198149
2018	1661.64479719
2019	1710.25087741
2020	1731.61570099
2021	1644.47907872