Year	current US$
2001	421.810998724303
2002	460.94766930920713
2003	543.9958779493263
2004	604.5919524472583
2005	715.7710192675718
2006	768.9572989068939
2007	789.250466688363
2008	959.7281458594688
2009	951.1853635658964
2010	986.3436609627645
2011	1161.2650022267098
2012	1196.32106525655
2013	969.959980944962
2014	1278.1025750222736
2015	910.1589186621786
2016	1110.032372609025
2017	1277.3363520855573
2018	1424.1068579055568
2019	1476.2785764357848
2020	1689.787167254138
2021	1909.6189293073144