Year	%
1992	12.64
1993	11.19
1995	12.1
1996	12.72
1997	12.83
1998	15.26
1999	15.09
2000	15.05
2001	12.71
2002	13.8
2003	14.15
2004	12.35
2005	11.21
2006	11.19
2007	12.15
2008	12.02
2009	12.92
2010	12.83
2011	12.64
2012	12.6
2013	13.39
2014	13.64
2015	13.64
2016	13.62
2017	13.69
2018	13.34
2019	13.19
2020	13.13
2021	13.11