Year	Percent
1999	96.15715
2000	96.77807
2001	96.62639
2002	97.36528
2003	97.37373
2004	97.11299
2005	97.18932
2006	97.33034
2007	98.09794
2008	97.89517
2009	98.2226
2010	94.36051