Year	%
1998	10.6
1999	12.1
2000	11.1
2001	10.3
2002	9.7
2003	9.3
2004	7.5
2005	8.9
2006	9.3
2007	8.7
2008	8.5
2009	7.9
2010	8.5
2011	8.2
2012	7
2013	6.6
2014	6.8
2015	6.2
2016	5.9
2017	5.2
2018	5.2
2019	5.5
2020	3.9