Year	%
1995	35.27
1996	41.91
1997	34.74
1998	34.71
1999	40.58
2000	39.9
2001	40.12
2002	40.04
2003	41.1
2004	35.46
2005	36.02
2006	40.75
2007	39.84
2008	37.09
2009	36.07
2010	40.03
2011	39.99
2012	40.32
2013	40.65
2014	38.61
2015	40.33
2016	42.21
2017	46.74