Year	%
1984	53.9
1987	52.7
1989	52
1992	53.1
1995	53.8
1997	54.3
2003	51.7
2006	50.3
2008	50.8
2011	49.6
2013	47.7
2015	47.3
2018	47.3
2021	46.9