Year	Percent
1965-01-01	76.1711
1966-01-01	79.7836
1967-01-01	68.0553
1968-01-01	64.0250
1969-01-01	64.8818
1970-01-01	62.6927
1971-01-01	68.8034
1972-01-01	87.4954
1973-01-01	96.7045
1974-01-01	96.7045
1975-01-01	96.7045
1976-01-01	96.7045
1977-01-01	96.7045
1978-01-01	96.7045
1979-01-01	96.7045
1980-01-01	96.7045
1981-01-01	96.7045
1982-01-01	96.7045
1983-01-01	96.7045
1984-01-01	96.7045
1985-01-01	96.7045
1986-01-01	96.7045
1987-01-01	96.7045
1988-01-01	96.7045
1989-01-01	96.7045
1990-01-01	96.7045
1991-01-01	96.7045
1992-01-01	98.5550
1993-01-01	96.1788
1994-01-01	95.6834
1995-01-01	97.4282
1996-01-01	98.6049
1997-01-01	97.5245
1998-01-01	96.9067
1999-01-01	98.2847
2000-01-01	99.0147
2001-01-01	97.6658
2002-01-01	94.4137
2003-01-01	94.9062
2004-01-01	95.4793
2005-01-01	95.7601
2006-01-01	98.0747
2007-01-01	98.0747
2008-01-01	98.0747
2009-01-01	99.2927
2010-01-01	99.3423