Year	Percent
1960-01-01	53.89650000000000
1961-01-01	52.07300000000000
1962-01-01	48.91020000000000
1963-01-01	47.53040000000000
1964-01-01	47.20370000000000
1965-01-01	48.66640000000000
1966-01-01	48.84750000000000
1967-01-01	47.62330000000000
1968-01-01	46.85420000000000
1969-01-01	47.06399999999999
1970-01-01	49.31940000000000
1971-01-01	50.98320000000000
1972-01-01	53.16550000000000
1973-01-01	53.85090000000000
1974-01-01	56.22300000000000
1975-01-01	59.59830000000000
1976-01-01	57.41210000000000
1977-01-01	56.45080000000000
1978-01-01	59.56110000000000
1979-01-01	61.91890000000000
1980-01-01	50.09390000000000
1981-01-01	42.07600000000000
1982-01-01	44.65390000000000
1983-01-01	47.27870000000000
1984-01-01	53.79890000000000
1985-01-01	55.58900000000000
1986-01-01	52.78380000000000
1987-01-01	54.20350000000000
1988-01-01	55.05390000000000
1989-01-01	57.57680000000000
1990-01-01	64.22510000000000
1991-01-01	59.39070000000000
1992-01-01	52.59770000000000
1993-01-01	63.72650000000000
1994-01-01	72.73880000000000
1995-01-01	81.92420000000000
1996-01-01	86.45450000000000
1997-01-01	89.38230000000000
1998-01-01	91.92950000000000
1999-01-01	90.28250000000000
2000-01-01	85.14000000000000
2001-01-01	83.90810000000000
2002-01-01	86.48180000000000
2003-01-01	89.22250000000000
2004-01-01	88.78690000000000
2005-01-01	89.31720000000000
2006-01-01	91.61160000000000
2007-01-01	92.55440000000000
2008-01-01	90.75840000000000
2009-01-01	90.78610000000000
2010-01-01	94.58230000000000
2011-01-01	93.22600000000000
2012-01-01	92.36530000000000
2013-01-01	95.24140000000000
2014-01-01	95.66040000000000
2015-01-01	94.89560000000000
2016-01-01	95.19970000000000