Year	Percent
1963-01-01	53.56980000000000
1964-01-01	52.44320000000000
1965-01-01	53.15920000000000
1966-01-01	54.79740000000000
1967-01-01	57.91150000000000
1968-01-01	61.00290000000000
1969-01-01	63.21120000000000
1970-01-01	61.94170000000000
1971-01-01	64.78670000000000
1972-01-01	68.89590000000000
1973-01-01	68.51500000000000
1974-01-01	64.35670000000000
1975-01-01	64.88480000000000
1976-01-01	61.11510000000000
1977-01-01	59.15390000000000
1978-01-01	56.74540000000000
1979-01-01	52.41690000000000
1980-01-01	49.68570000000000
1981-01-01	48.06940000000000
1982-01-01	46.32950000000000
1983-01-01	44.87380000000000
1984-01-01	45.04320000000000
1985-01-01	45.81470000000000
1986-01-01	45.62230000000000
1987-01-01	46.17100000000001
1988-01-01	47.01350000000000
1989-01-01	48.60590000000000
1990-01-01	49.45270000000000
1991-01-01	51.98900000000000
1992-01-01	55.47150000000000
1993-01-01	57.47870000000000
1994-01-01	55.42570000000000
1995-01-01	53.12510000000000
1996-01-01	51.97520000000000
1997-01-01	51.70800000000000
1998-01-01	53.35160000000000
1999-01-01	62.68600000000001
2000-01-01	70.33020000000000
2001-01-01	59.91570000000000
2002-01-01	60.33270000000000
2003-01-01	62.86600000000001
2004-01-01	65.30020000000000
2005-01-01	68.36680000000000
2006-01-01	72.11150000000000
2007-01-01	77.23090000000000
2008-01-01	82.95920000000000
2009-01-01	87.33870000000000
2010-01-01	89.65930000000000
2011-01-01	93.26150000000000
2012-01-01	95.66010000000000
2013-01-01	93.24390000000000
2014-01-01	89.68180000000000
2015-01-01	87.41530000000000
2016-01-01	85.41710000000000