Year	US Dollars
1993	78.99496
1994	199.45924
1995	207.74924
1996	213.45078
1997	226.50137
1998	220.62129
1999	203.81396
2000	234.24509
2001	332.77582
2002	315.9324
2003	330.22193
2004	358.65743
2005	305.90027
2006	399.3296
2007	491.37558
2008	687.66589
2009	766.49337
2010	663.6168
2011	627.02775
2012	504.04799
2013	638.34105
2014	596.11858
2015	438.44722
2016	549.94539
2017	481.9919
2018	502.54239
2019	489.9808
2020	423.34086
2021	438.42577