Year	Percent
1993	2.52563
1994	2.11974
1995	0.55058
1996	0.3599
1997	0.41167
1998	9.56603
1999	12.33081
2000	11.28624
2001	9.50852
2002	11.11459
2003	11.34644
2004	10.18017
2005	9.64113
2006	9.79143
2007	8.81754
2008	5.95036
2009	7.3251
2010	7.69205
2011	6.06823
2012	6.35075
2013	6.55095
2014	5.31384
2015	3.53681
2016	3.67189