Year	%
1995	13.99
1996	25.25
1997	13.87
1998	13.85
1999	25.6
2000	23.99
2001	25.02
2002	27.91
2003	27.07
2004	25.74
2005	22.65
2006	26.59
2007	27.05
2008	25.01
2009	23.77
2010	29.04
2011	27.66
2012	27.1
2013	27.11
2014	23.88
2015	21.71
2016	22.25
2017	37.86