Year	%
1998	91.12815
1999	95.08576
2000	92.8425
2001	91.73631
2002	92.12732
2003	91.59757
2004	90.23344
2006	88.3729
2007	89.2943
2008	90.13311
2009	91.99547
2010	92.9802
2011	94.45507