Year	Percent
1975-12-31	10.7188
1976-12-31	14.75
1977-12-31	6.6875
1978-12-31	11.875
1979-12-31	17.2813
1980-12-31	14.5
1981-12-31	14.625
1982-12-31	10.0625
1983-12-31	8.9845
1984-12-31	9.375
1985-12-31	11.3285
1986-12-31	10.82
1987-12-31	8.385
1988-12-31	12.68
1989-12-31	13.735
1990-12-31	13.725
1991-12-31	10.28
1992-12-31	6.59
1993-12-31	5.095
1994-12-31	5.925
1995-12-31	6.395
1996-12-31	5.97
1997-12-31	7.22
1998-12-31	5.935
1999-12-31	5.39
2000-12-31	5.82
2001-12-31	3.96
2002-12-31	3.96
2003-12-31	3.85
2004-12-31	4.75