Year	Percent
1997-01-01	2.78
1998-01-01	3.55
1999-01-01	5.46
2000-01-01	6.61
2001-01-01	7.12
2002-01-01	11.45
2003-01-01	11.51
2004-01-01	11.17
2005-01-01	11.66
2006-01-01	12.52
2007-01-01	10.50