Year	%
2004	73.7
2005	80.2
2006	79.2
2007	84
2008	84.3
2009	82.5
2010	79.5
2011	80.3
2012	73.4
2013	78.2
2014	75.2
2015	75.6
2016	73.6
2017	72.2
2018	70.2
2019	69.9
2020	72.3