Year	Percent
1997	96.45658
1998	96.25267
1999	96.81011
2000	96.42308
2001	95.82174
2002	96.15279
2003	96.23818
2004	96.50878
2005	95.97353
2006	96.04665
2007	95.39624
2011	95.66347