Year	current US$
1995	730.712890625
1996	678.98583984375
1997	778.714294433594
1998	653.420288085938
1999	488.977264404297
2000	491.862457275391
2001	615.065307617188
2002	696.734802246094
2003	828.95849609375
2004	1102.45275878906
2005	1503.66528320313
2006	1893.58850097656
2007	2583.10986328125
2008	3273.69970703125
2009	2046.994140625
2010	2467.41235351563
2011	2949.33349609375
2012	3400.23022460938
2013	3523.06079101563
2014	2651.28735351563
2015	1935.65661621094
2016	1910.05041503906
2017	2340.39501953125
2018	2723.015625
2019	3234.33544921875
2020	3317.01782226563
2021	3961.404296875