Year	current US$
2000	0.06598201
2001	12.10030203
2002	12.20584966
2003	21.91260773
2004	7.85378311
2005	5.79793862
2006	46.26816472
2007	14.71119459
2008	5.67171843
2009	46.69843855
2010	59.44670231
2011	60.43280415
2012	43.73174381
2013	137.92123373
2014	74.28561833
2015	108.70495994
2016	108.28303782
2017	192.93370703
2018	119.4786081
2019	234.34801978
2020	146.20344349
2021	498.17725041