Year	current US$
2000	300.2972402
2001	337.40475584
2002	326.02687552
2003	366.7329766
2004	345.91952067
2005	355.56208704
2006	350.94037122
2007	365.26142005
2008	350.88516232
2009	333.15748216
2010	420.41751829
2011	406.60982793
2012	422.18284491
2013	412.47860961
2014	486.52550602
2015	469.12111023
2016	453.78668177
2017	441.13693566
2018	510.53232213
2019	468.42029704
2020	545.41759995
2021	619.75738215