Year	US Dollars
1991	5.95074
1992	116.00542
1993	616.21445
1994	929.57468
1995	658.55389
1996	1357.05698
1997	1010.92479
1998	799.03693
1999	1097.44774
2000	875.25817
2001	1244.37173
2002	1022.64386
2003	956.63665
2004	917.05701
2005	1035.94238
2006	1020.69809
2007	986.71305
2008	988.73939
2009	1141.19381
2010	466.7141
2011	1595.58998
2012	1606.2295
2013	1825.44006
2014	1104.74227
2015	1154.82699
2016	259.88538
2017	1536.65209
2018	1182.89159
2019	1475.13869
2020	4216.9398
2021	2547.44358