Year	Percent
1980-01-01	35.19747000000000000000
1981-01-01	37.60156000000000000000
1982-01-01	24.46568000000000000000
1983-01-01	24.85639000000000000000
1984-01-01	24.69481000000000000000
1985-01-01	26.64367000000000000000
1986-01-01	27.07202999999999800000
1987-01-01	28.86277000000000000000
1988-01-01	30.75815999999999700000
1989-01-01	37.37335000000000000000
1990-01-01	0.38812520000000000000
1991-01-01	0.74780269999999990000
1992-01-01	2.05538500000000000000
1993-01-01	1.98087700000000000000
1994-01-01	1.96308100000000000000
1995-01-01	3.32710700000000000000
1996-01-01	1.89793700000000000000
1997-01-01	0.50194259999999990000
1998-01-01	1.64398100000000010000
1999-01-01	2.69067500000000000000
2000-01-01	2.47159000000000000000
2001-01-01	1.11548500000000000000
2002-01-01	0.37425010000000000000
2003-01-01	0.06371050000000000000
2004-01-01	0.00011030000000000000
2005-01-01	0.00011030000000000000
2006-01-01	0.00000426000000000000
2007-01-01	0.00030160000000000000
2008-01-01	0.00047910000000000004
2009-01-01	0.00046540000000000000
2010-01-01	0.00023100000000000000