Year	%
1991	14.5
1994	8.15
1995	10.4
1996	9.42
1997	9.9
1998	10.24
1999	10.5
2000	11.73
2001	11.94
2002	11.34
2003	11.55
2004	11.72
2005	9.5
2006	5.41
2007	6.92
2008	7.25
2009	7.26
2010	7.51
2011	7.98
2012	8.18
2013	8.32
2014	8.12
2015	8.49
2016	8.14
2017	7.97
2018	8.05
2019	8.05
2020	7.39
2021	7.59