Year	%
1993	7.81
1994	11.69
1996	11.65
1997	12.62
2001	10.87
2002	10.68
2005	10.58
2007	10.05
2008	9.9
2009	9.95
2010	9.01
2011	8.96
2012	9.06
2013	8.83
2014	8.07
2015	7.52
2016	6.79
2017	6.42
2018	6.42
2019	8.52
2020	6.33
2021	6.86