Year	%
1995	37
2000	34.2
2003	32.8
2004	33.6
2005	34.6
2006	35.1
2007	34
2008	33.6
2009	33.6
2010	34.1
2011	34.8
2012	36.3
2013	36.1
2014	35.8
2015	36
2016	35
2017	34.4
2018	32.9
2019	33.1
2020	33.6
2021	32.9