Year	current US$
2000	302.56324818448644
2001	300.1704492604422
2002	325.53497376576473
2003	348.050392357445
2004	374.31915288287536
2005	400.75821639174984
2006	446.48104331611404
2007	479.300432145542
2008	514.9352969963916
2009	524.5047060462028
2010	535.86463310679
2011	547.1076872705788
2012	580.9278718765624
2013	592.8297389328189
2014	600.8281204814043
2015	611.065203867131
2016	604.8911962504467
2017	660.551711259731
2018	668.8674461293742
2019	706.4858573745262
2020	691.3220743626179
2021	725.1890365169498