Year	%
1995	34.93
1996	41.73
1997	34.2
1998	34.32
1999	40.5
2000	36.35
2001	35.13
2002	35.91
2003	35.59
2004	27.69
2005	27.88
2006	34.26
2007	32.86
2008	29.43
2009	27.64
2010	32.58
2011	32.22
2012	33.15
2013	33.41
2014	27.67
2015	31.39
2016	31.02
2017	40.49