Year	%
1991	15.43
1994	8.77
1995	9.9
1996	11.61
1997	11.79
1998	12.04
1999	10.88
2000	13.59
2001	13.66
2002	13.48
2003	13.54
2004	9.93
2005	8.57
2006	7.31
2007	8.18
2008	8.6
2009	8.1
2010	8.46
2011	8.53
2012	8.48
2013	8.33
2014	8.25
2015	8.22
2016	8.45
2017	8.27
2018	8.3
2019	8.3
2020	7.59
2021	8.25