Year	Percent
1990-01-01	76.69800000000001
1991-01-01	79.55740000000000
1992-01-01	75.56670000000000
1993-01-01	76.70020000000000
1994-01-01	90.34680000000000
1995-01-01	98.10310000000000
1996-01-01	98.67620000000000
1997-01-01	94.81950000000000
1998-01-01	94.00420000000000
1999-01-01	91.39590000000000
2000-01-01	84.82020000000000
2001-01-01	83.92230000000000
2002-01-01	86.01310000000000
2003-01-01	89.02580000000000
2004-01-01	86.06070000000000
2005-01-01	79.15730000000000
2006-01-01	77.12730000000000
2007-01-01	81.10670000000000
2008-01-01	80.17630000000000
2009-01-01	86.77410000000000
2010-01-01	93.22030000000000
2011-01-01	91.15990000000000