Year	%
1986	20.4
1990	18.6
1994	17.7
1998	19.3
2005	17.4
2006	18.6
2009	17.9
2011	12.1
2012	11.1
2013	10.1
2014	11.2
2015	11.8
2016	11.8
2017	12.4
2018	12.3
2019	12
2020	12.7
2021	13.2
2022	12.5