Year	%
1996	20.89
1999	17.64
2000	11.72
2001	17.53
2002	11.96
2003	11.9
2006	10.02
2007	10.03
2008	10.07
2010	8.95
2011	11.06
2012	10.54
2013	10.27
2015	9.88
2016	10.01
2019	9.24