Year	%
1995	22.9
2000	23.1
2003	23.3
2004	23
2005	22.7
2006	22.6
2007	22.6
2008	22.5
2009	22.5
2010	22.9
2011	23.3
2012	23.2
2013	23.2
2014	23.3
2015	23.5
2016	23.2
2017	23
2018	23.1
2019	23.1
2020	23
2021	23.1