Year	%
1995	18.65
1996	16
1997	17.54
1998	16.01
1999	17.98
2000	17.99
2001	17.35
2002	18.09
2003	19.37
2004	19.18
2005	18.39
2006	22.59
2007	22.58
2008	22.62
2009	18.37
2010	22.48
2011	22.54
2012	20.62
2013	23.4
2014	14.28
2015	20.31
2016	19.89
2017	26.67