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	12.94
2007	13.01
2010	11.11
2011	14.32
2012	12.21
2013	14.32
2015	14
2016	14
2017	13.76
2020	9.88