Year	%
1990	14.5
1992	12.5
1997	11.1
1999	11.7
2000	10.7
2001	11.6
2002	11
2004	11.4
2005	10.8
2006	11.3
2007	11.8
2008	13.1
2009	13.9
2011	14.3
2012	14.5
2013	14
2014	13.8
2015	14.2
2016	14.7
2017	14.8
2018	15.2
2019	15
2020	14.5
2021	15.3