Year	Percent
1989-12-31	10.885
1990-12-31	9.835
1991-12-31	10.255
1992-12-31	10.13
1993-12-31	6.16
1994-12-31	6.07
1995-12-31	4.99
1996-12-31	3.95
1997-12-31	4.2
1998-12-31	2.96
1999-12-31	3.15
2000-12-31	4.73
2001-12-31	3.2
2002-12-31	2.77
2003-12-31	2.04
2004-12-31	2.06
2005-12-31	2.35