Year	%
1996	15.45
1997	15.72
1999	15.65
2000	14.18
2001	14.19
2002	14.13
2003	14.43
2004	14.44
2005	14.46
2006	14.11
2007	13.87
2008	13.87
2009	13.84
2010	13.41
2011	13.48
2012	12.88
2013	12.55
2014	12.55
2015	11.33
2016	11.62
2017	12.68
2018	12.35
2019	11.26
2020	11.26
2021	10.92