Year	%
1996	15.36
1997	16.12
1999	16.92
2000	10.64
2001	10.46
2002	10.12
2003	10.07
2004	10.07
2005	9.74
2006	9.57
2007	9.51
2008	9.51
2009	10.03
2010	9.69
2011	9.98
2012	9.11
2013	9.09
2014	9.09
2015	10.62
2016	9.58
2017	14.4
2018	14.04
2019	13.51
2020	13.51
2021	11.62