Year	%
1991	57.6
1995	54.5
1996	55.5
1998	57.5
1999	55.7
2000	55.8
2001	55.5
2002	55.7
2003	54.2
2004	52.3
2005	53.2
2006	51.3
2007	51.2
2008	52.4
2009	51.6
2010	49.4
2011	48.7
2012	48.2
2013	49.6
2014	48
2015	47.2
2016	46.4
2017	44.7
2018	45.2
2019	45.6
2021	45
2022	44.8