Year	%
1995	40.36
1996	44.32
1997	53.35
1998	47.22
1999	50.75
2000	58.43
2001	44.05
2002	42.96
2003	49.07
2004	39.44
2005	44.29
2006	46.48
2007	40.77
2008	43.47
2009	43.37
2010	44.13
2011	44.32
2012	43.95
2013	44.69
2014	46.4
2015	41.48
2016	44.78
2017	26.16