Year	%
1997	12.26
1998	8.26
1999	8.32
2000	8.17
2001	7.97
2002	8.26
2003	7.83
2004	7.82
2005	7.41
2006	7.67
2007	7.4
2008	7.31
2009	7.76
2010	7.48
2011	7.3
2012	7.28
2013	6.93
2015	7.37
2020	6.19
2021	5.99