Year	%
1992	17.02
1995	13.94
1997	12.3
1998	12.33
1999	12.39
2000	12.34
2001	12.37
2002	12.72
2003	12.7
2004	12.38
2005	12.37
2006	13.09
2007	13.09
2008	13.21
2009	13.21
2010	13.21
2011	13.21
2012	13.21
2013	13.2
2014	12.9
2015	13.34
2016	13.07
2017	15.25
2018	15.25
2019	15.25
2020	15.25
2021	15.25