Year	%
1986	52.7
1990	49.4
1994	49.1
1998	49.9
2005	49.6
2006	50.6
2009	47.8
2011	42.2
2012	42.2
2013	41.9
2014	42.4
2015	42.9
2016	43.5
2017	44
2018	44.7
2019	43.8
2020	43.2
2021	42.8
2022	42.2