Year	%
1992	92.81828
1993	93.29727
1994	93.02475
1995	93.61681
1996	94.73616
1997	95.14419
1998	95.84454
1999	96.29754
2000	96.59308
2001	96.12393
2002	96.33255
2003	97.27022
2004	97.72596
2005	98.24187
2006	98.20124
2007	98.25778
2008	98.27214
2009	98.28455
2010	98.35818
2011	98.29802
2012	97.04813
2013	97.83622
2014	98.02717
2015	98.53174
2016	98.58311
2017	98.62727