Year	%
1987	86.03102
1999	97.97378
2000	90.68627
2002	97.82323
2004	99.03398
2005	92.9678
2007	97.08084
2008	91.59973
2009	98.04958
2010	99.86204
2011	99.94051
2012	94.88255
2013	96.44359
2014	96.16173