Year	%
2002	16.46
2003	16.21
2004	16.23
2005	16.21
2006	15.81
2007	16.53
2008	16.7
2009	16.69
2012	10.32
2015	9.08
2016	8.98
2017	8.66
2020	9.95
2021	9.13