Year	%
1990	8.8
1993	9.6
1996	12.2
1999	14.5
2002	17.6
2005	16.7
2008	19.4
2010	20
2011	18.7
2012	18.9
2013	15.4
2014	15.4
2015	14.9
2016	14.7
2017	15
2018	14.7
2019	13.8
2020	11.6