Year	%
1997	17.1
1998	10.68
1999	11.7
2000	11.8
2001	11.56
2002	12.33
2003	11.78
2004	11.79
2005	11.64
2006	11.64
2007	11.44
2008	11.49
2009	11.28
2010	10.96
2011	10.74
2012	10.98
2013	10.95
2015	10.87
2020	8.98
2021	9.02