Year	%
1991	7.52
1992	10.62
1994	12.08
1995	12.08
1996	12.4
1997	12.34
1998	12.93
1999	13.21
2000	12.7
2001	13.06
2002	12.99
2003	12.75
2004	13.24
2005	12.55
2006	13.4
2007	13.46
2008	12.78
2009	13.51
2010	12.88
2011	10.13
2012	8.37
2013	7.57
2014	7.68
2015	8.46
2016	8.81
2017	14.86
2018	13.2
2019	13.51
2020	13.51
2021	13.27