Year	%
1995	35.27
1996	45.11
1997	34.74
1998	34.71
1999	43.51
2000	42.55
2001	43.06
2002	42.96
2003	44.09
2004	38.22
2005	36.95
2006	43.69
2007	42.76
2008	39.35
2009	37.83
2010	42.97
2011	42.94
2012	43.27
2013	43.54
2014	40.5
2015	41.58
2016	43.61
2017	49.81