Year	%
1997	10.62
1998	8.69
1999	7.83
2000	7.19
2001	6.86
2002	7.46
2003	7.89
2004	7.63
2005	7.16
2006	8
2007	8.01
2008	8.14
2009	7.04
2010	6.93
2011	5.76
2012	6.13
2013	6.12
2015	5.41
2020	5.77
2021	6.43