Year	%
1991	15.62
1994	8.03
1995	11.43
1996	11.5
1997	11.7
1998	11.79
1999	13.64
2000	13.73
2001	13.45
2002	13.2
2003	13.24
2004	12.41
2005	11.21
2006	10.41
2007	10.94
2008	10.84
2009	10.84
2010	10.82
2011	10.89
2012	10.89
2013	10.65
2014	10.56
2015	10.56
2016	10.56
2017	10.37
2018	10.37
2019	10.37
2020	10.34
2021	10.34