Year	%
1991	15.35
1994	8.75
1995	9.72
1996	11.67
1997	11.8
1998	12.04
1999	10.78
2000	13.6
2001	13.59
2002	13.39
2003	13.44
2004	9.7
2005	8.41
2006	7.17
2007	8
2008	8.46
2009	7.95
2010	8.33
2011	8.4
2012	8.34
2013	8.24
2014	8.14
2015	8.1
2016	8.28
2017	8.11
2018	8.14
2019	8.14
2020	7.46
2021	8.11