Year	Percent
1989-01-01	53.05470000000000
1990-01-01	64.62680000000000
1991-01-01	80.17780000000000
1992-01-01	81.36840000000000
1993-01-01	83.43080000000000
1994-01-01	86.44190000000000
1995-01-01	87.25710000000000
1996-01-01	87.83700000000000
1997-01-01	81.68260000000000
1998-01-01	73.50460000000000
1999-01-01	66.00550000000000
2000-01-01	65.73060000000000
2001-01-01	69.06400000000000
2002-01-01	68.33460000000000
2003-01-01	67.86399999999999
2004-01-01	70.40490000000000
2005-01-01	77.34630000000000
2006-01-01	80.01310000000000
2007-01-01	77.74670000000000
2008-01-01	78.03990000000000
2009-01-01	75.92490000000000
2010-01-01	75.73140000000000