Year	current US$
2000	200.98800659
2001	197.28829956
2002	200.33074951
2003	262.04077148
2004	288.94662476
2005	273.51931763
2006	250.76968384
2007	296.56552124
2008	315.27059937
2009	326.95220947
2010	378.646698
2011	415.58108521
2012	405.96008301
2013	418.32351685
2014	402.45758057
2015	358.22320557
2016	369.84204102
2017	444.55603027
2018	419.6545105
2019	408.89602661
2020	358.90551758
2021	457.46298218