Year	%
1991	15.53
1994	7.9
1995	10.74
1996	10.96
1997	11.07
1998	11.13
1999	13.18
2000	13.16
2001	12.74
2002	12.46
2003	12.47
2004	11.86
2005	10.6
2006	9.95
2007	10.38
2008	10.33
2009	10.33
2010	10.32
2011	10.37
2012	10.37
2013	10.14
2014	10.08
2015	10.08
2016	10.08
2017	9.94
2018	9.94
2019	9.94
2020	9.91
2021	9.91