Year	%
1996	18.61
1997	15.98
1998	16
1999	15.96
2000	13.82
2001	13.51
2002	14.82
2003	14.2
2006	7.78
2007	7.85
2010	11.11
2011	8.18
2012	8.15
2013	8.7
2015	13.72
2016	8.41
2017	8.3
2020	7.84