Year	%
1992	14.23
1993	12.89
1995	13.13
1996	13.91
1997	14.07
1998	16.39
1999	16.18
2000	16.1
2001	13.26
2002	14.95
2003	15.81
2004	13.1
2005	12.01
2006	11.98
2007	13.14
2008	12.96
2009	14.15
2010	14.04
2011	13.79
2012	13.74
2013	15.02
2014	15.31
2015	15.31
2016	15.31
2017	15.39
2018	14.92
2019	14.72
2020	14.64
2021	14.61