Year	current US$
2000	208.08170779
2001	211.42314479
2002	229.31299497
2003	284.44601237
2004	326.66915123
2005	342.22096924
2006	373.55853277
2007	480.09610187
2008	532.66447151
2009	448.33227254
2010	430.43236807
2011	473.85810285
2012	435.70710781
2013	486.28468724
2014	510.85045062
2015	442.73957589
2016	455.5357205
2017	450.90584204
2018	503.65536854
2019	514.24817279
2020	468.15017528
2021	593.71520822