Year	%
1990	12.4
1993	12
1996	11.5
1999	10.5
2002	9.6
2005	10
2008	9.4
2010	9.2
2011	9.6
2012	9.7
2013	10.3
2014	10.5
2015	10.6
2016	10.7
2017	10.5
2018	10.7
2019	10.7
2020	11