Year	%
1997	9.58
1998	9.65
1999	7.47
2000	6.14
2001	5.8
2002	6.96
2003	9.68
2004	8.5
2005	7.88
2006	8.91
2007	9.07
2008	11.3
2009	11.94
2010	12.36
2011	11.25
2012	7.27
2013	7.55
2015	13.52
2020	14.16
2021	12.47