Year	%
1984	42
1987	40.8
1990	41.6
1993	42.4
1996	44.4
1998	41.4
1999	41.4
2000	39.3
2001	39.8
2002	42.2
2003	42.1
2004	42.6
2005	42.8
2006	43.7
2007	44.8
2008	44.3
2009	44.4
2010	45
2011	47.9
2012	48.1
2013	48.6
2014	47.9
2015	47.9
2016	46.5
2017	45.9
2018	45.6
2019	45
2020	45
2021	45.4
2022	45.8
2023	46.3