Year	%
1997	11.54
1998	7.96
1999	7.88
2000	7.7
2001	7.52
2002	7.49
2003	7.32
2004	7.34
2005	6.95
2006	7.17
2007	6.97
2008	6.87
2009	7.34
2010	7.08
2011	6.93
2012	6.82
2013	6.42
2015	7.06
2020	5.48
2021	5.3