Year	%
1984	48.6
1987	47
1989	46.2
1992	47.7
1995	48.5
1997	49.1
2003	46.4
2006	44.8
2008	45.5
2011	43.9
2013	41.3
2015	41.1
2018	41.2
2021	40.7