Year	%
1997	81.25176
1999	87.23746
2000	87.95227
2001	89.14747
2002	88.95583
2003	88.59806
2004	88.40927
2005	87.87716
2006	84.76176
2007	94.04257
2008	88.14103
2009	87.04365