Year	%
1986	13.4
1990	14.4
1994	14.4
1998	14.2
2005	14.2
2006	13.8
2009	14.7
2011	16.3
2012	16.2
2013	16.2
2014	16.1
2015	16
2016	15.8
2017	15.7
2018	15.4
2019	15.8
2020	15.9
2021	16.1
2022	16.3