Year	Percent
1994	19.21
1998	27.7
1999	31.3
2000	5.47
2001	5.51
2002	29.85
2003	29.71
2004	32.03
2005	31.66
2006	27.42
2007	26.12
2008	24.05
2009	24.74
2010	23.27
2011	22.71
2012	21.55
2013	21.5
2014	22