Year	Percent
1994	0.70979
1995	0.21329
1996	0.2535
1997	0.42138
1998	4.21395
1999	2.40673
2000	5.76506
2001	12.65813
2002	2.84179
2003	2.40669
2004	5.43996
2005	2.32208
2006	6.22986
2007	8.79828
2008	6.17272
2009	2.76045
2010	3.20438
2011	4.83981
2012	3.46745
2013	3.72036
2014	0.53581
2015	2.9508
2016	5.11243
2017	3.79877