Year	%
2000	31.1
2001	31.1
2002	31
2003	31
2004	31
2005	31
2006	31.1
2007	31.1
2008	31.1
2009	31.1
2010	31.1
2011	31.2
2012	31.3
2013	31.4
2014	31.6
2015	31.7
2016	31.9
2017	32
2018	32.1
2019	32.2