Year	%
1987	61.4
1990	62.5
1992	60.1
1994	61.5
1996	60.1
1998	60.7
2000	58
2003	56.8
2006	53.8
2009	53.8
2011	53.4
2013	53.6
2015	52.1
2017	52
2020	53.3
2022	49.9