Year	US Dollars
1992	1.6784
1993	7.71139
1994	6.43111
1995	7.26348
1996	5.49628
1997	4.77121
1998	6.21232
1999	5.63198
2000	7.77609
2001	16.1658
2002	9.38717
2003	6.06011
2004	11.2121
2005	5.94583
2006	8.2983
2007	5.72549
2008	3.55288
2009	7.84411
2010	8.3144
2011	7.61452
2012	6.8991
2013	6.45852
2014	6.08848
2015	3.97993
2016	5.49198
2017	4.71484
2018	3.37342
2019	4.11307
2020	5.7308
2021	4.36308