Year	Percent
1997-01-01	82.15180000000000
1998-01-01	76.63410000000000
1999-01-01	93.43820000000000
2000-01-01	96.42399999999999
2001-01-01	78.45160000000000
2002-01-01	78.45160000000000
2003-01-01	78.45160000000000
2004-01-01	77.95940000000000
2005-01-01	71.59910000000000
2006-01-01	31.33260000000000
2007-01-01	29.73370000000000
2008-01-01	71.82200000000000