Year	current US$
2000	149.57020569
2001	162.7335968
2002	175.32115173
2003	178.18965149
2004	188.8163147
2005	198.34997559
2006	210.94276428
2007	245.88890076
2008	257.7953186
2009	266.22644043
2010	283.59768677
2011	277.79837036
2012	300.58456421
2013	301.93356323
2014	301.07556152
2015	303.9425354
2016	314.80490112
2017	338.26269531
2018	357.32647705
2019	369.37362671
2020	402.05984497
2021	448.31021118