Year	current US$
2000	244.52847457
2001	259.7189615
2002	288.94126617
2003	368.50364444
2004	426.39180457
2005	448.41679034
2006	471.40777188
2007	540.36160838
2008	618.22924201
2009	558.65813214
2010	566.02550382
2011	593.18622653
2012	564.86070597
2013	598.8540388
2014	619.89143081
2015	523.78264737
2016	521.89634147
2017	561.63217863
2018	609.80485844
2019	593.13464296
2020	571.93189335
2021	679.0964175