Year	%
1987	45.4
1990	47.1
1992	45.2
1994	45.9
1996	44.4
1998	45
2000	42.6
2003	41.4
2006	38.2
2009	38.4
2011	38
2013	38.2
2015	36.8
2017	36.9
2020	37.3
2022	34.5