Year	%
1995	42.85
1996	39.52
1997	40.22
1998	44.12
1999	41.79
2000	40.2
2001	36.91
2002	38.96
2003	36.16
2004	39.72
2005	39.27
2006	39.16
2007	34.62
2008	36.08
2009	34.89
2010	36.14
2011	37.31
2012	35.49
2013	37.75
2014	34.1
2015	36.33
2016	38.07
2017	31.47