Year	current US$
2000	63.33945645
2001	95.4325341
2002	57.61300929
2003	75.31945789
2004	95.7353373
2005	108.80487016
2006	107.85161037
2007	92.12445343
2008	129.20438602
2009	106.08003284
2010	135.8107581
2011	121.25367712
2012	142.51742451
2013	125.06050219
2014	196.34721985
2015	171.37501544
2016	198.1210218
2017	194.23699371
2018	206.09774894
2019	205.90132456
2020	168.23649348
2021	168.76054852