Year	Percent
1960-01-01	4.46820000000000000
1961-01-01	4.09927000000000000
1962-01-01	3.97949000000000000
1963-01-01	4.30645999999999950
1964-01-01	4.37047000000000000
1965-01-01	4.83890000000000000
1966-01-01	5.34130000000000000
1967-01-01	5.99044000000000000
1968-01-01	6.58566000000000100
1969-01-01	6.64423999999999900
1970-01-01	6.49541000000000000
1971-01-01	7.34134000000000000
1972-01-01	8.59176000000000000
1973-01-01	8.96964000000000000
1974-01-01	9.08990000000000000
1975-01-01	9.46723999999999900
1976-01-01	8.60761000000000100
1977-01-01	8.24556999999999900
1978-01-01	8.07333000000000000
1979-01-01	5.48311000000000000
1980-01-01	5.28094000000000000
1981-01-01	5.87116999999999900
1982-01-01	6.97390000000000000
1983-01-01	7.90270000000000000
1984-01-01	7.53523999999999900
1985-01-01	6.91011000000000000
1986-01-01	5.89234000000000000
1987-01-01	5.54871000000000000
1988-01-01	4.57978000000000000
1989-01-01	2.47546000000000000
1990-01-01	1.78983000000000000
1991-01-01	1.67730999999999990
1992-01-01	1.72605000000000000
1993-01-01	1.26230000000000000
1994-01-01	0.83849400000000010
1995-01-01	0.67604000000000000
1996-01-01	0.63711300000000000
1997-01-01	0.58636800000000000
1998-01-01	0.57445400000000000
1999-01-01	0.51666499999999990
2000-01-01	0.44290700000000000
2001-01-01	0.39015300000000000
2002-01-01	0.33963200000000000
2003-01-01	0.32958000000000004
2004-01-01	0.31083200000000000
2005-01-01	0.29570799999999997
2006-01-01	0.26480500000000000
2007-01-01	0.23861999999999997
2008-01-01	0.22626300000000002
2009-01-01	0.22715600000000000
2010-01-01	0.19779300000000000
2011-01-01	0.17722600000000000