Year	%
1991	11.85
1994	8.02
1995	10.71
1996	10.45
1997	11.33
1998	11.46
1999	11.11
2000	10.93
2001	10.74
2002	9.94
2003	9.85
2004	10.31
2005	8.38
2006	5.16
2007	6.57
2008	6.55
2009	6.77
2010	7.14
2011	7.38
2012	7.37
2013	7.56
2014	7.39
2015	7.83
2016	7.71
2017	8.45
2018	8.54
2019	8.54
2020	7.88
2021	7.91