Year	%
1996	15.63
1999	11.19
2001	10.72
2002	11.65
2003	11.35
2006	9.57
2007	9.27
2008	8.96
2009	11.68
2010	11.73
2011	8.47
2012	8.16
2013	10.05
2014	10.05
2015	10.04
2016	10.52
2017	10.39
2018	11.08
2019	11.17
2020	18.69
2021	17.79