Year	%
1995	43.77
1997	39
1998	42.83
1999	34.65
2000	33.73
2001	27.52
2002	37.16
2003	34.23
2004	36.06
2005	32.7
2006	32.7
2007	30.56
2008	32.14
2009	32.99
2010	42.23
2011	34.86
2012	33.08
2013	31.28
2014	31.62
2015	31.3
2016	33.35
2017	36.58