Year	%
1991	92.61237
1994	94.46985
1995	94.97808
1999	96.46268
2000	95.2414
2002	97.25106
2003	96.50155
2004	96.0831
2005	94.1349
2006	95.71803
2007	96.50725
2008	96.51908
2009	97.55081
2010	98.11879
2011	97.76474
2012	95.30847
2013	98.52204
2014	95.42334
2015	97.79266
2016	96.98988
2017	97.27735