Year	current US$
2000	65.39257743336611
2001	72.19978278852916
2002	85.75805964201018
2003	104.46712792687613
2004	129.30548830641922
2005	162.90765816495173
2006	197.26402925582823
2007	252.79810346448994
2008	323.35843941913055
2009	284.84593578722644
2010	301.61653952396995
2011	333.2156491691952
2012	350.0159172757534
2013	368.1007885997243
2014	348.0890879431632
2015	265.7566807629369
2016	257.6202774783802
2017	285.71317209868215
2018	303.1192961062801
2019	323.26585743588294
2020	385.892979477224
2021	454.0231988412953