Year	%
1998	79.75323
2000	78.60518
2001	84.96464
2002	84.81348
2003	84.76143
2004	84.40308
2005	83.46385
2006	81.56887
2007	81.44073
2009	82.59911
2010	81.86726
2011	81.02214
2012	80.20483
2013	79.65697
2014	81.69917
2015	85.04363
2016	87.23371
2017	89.84526