Year	Percent
1992-01-01	100.00000
1993-01-01	98.90296
1994-01-01	98.66043
1995-01-01	98.26435
1996-01-01	98.20679
1997-01-01	98.16028
1998-01-01	98.16331
1999-01-01	95.95374
2000-01-01	94.91048
2001-01-01	91.45697
2002-01-01	91.63574
2003-01-01	90.62166
2004-01-01	88.55563
2005-01-01	87.23505
2006-01-01	88.32604
2007-01-01	90.03045
2008-01-01	91.97622
2009-01-01	94.22247