Year	Percent
1988-12-31	7.8801
1989-12-31	9.1618
1990-12-31	8.1481
1991-12-31	5.8301
1992-12-31	3.6499
1993-12-31	3.1016
1994-12-31	4.3784
1995-12-31	5.8796
1996-12-31	5.3526
1997-12-31	5.5428
1998-12-31	5.4678
1999-12-31	5.1607
2000-12-31	6.3536
2001-12-31	3.916
2002-12-31	1.708
2003-12-31	1.1527
2004-12-31	1.4532
2005-12-31	3.3421
2006-12-31	5.0609
2007-12-31	5.2411
2008-12-31	2.7788
2009-12-31	0.3666
2010-12-31	0.2794
2011-12-31	0.2341
2012-12-31	0.2564