Year	Percent
1960-01-01	68.02650000000000
1961-01-01	64.63300000000000
1962-01-01	58.30140000000000
1963-01-01	58.65630000000000
1964-01-01	57.88320000000000
1965-01-01	58.07370000000000
1966-01-01	63.80880000000000
1967-01-01	65.65980000000000
1968-01-01	66.23210000000000
1969-01-01	67.30480000000000
1970-01-01	64.46960000000000
1971-01-01	65.70980000000000
1972-01-01	70.10950000000000
1973-01-01	76.16240000000000
1974-01-01	83.20880000000000
1975-01-01	85.84700000000001
1976-01-01	89.61480000000000
1977-01-01	89.61480000000000
1978-01-01	89.61480000000000
1979-01-01	89.61480000000000
1980-01-01	89.61480000000000
1981-01-01	89.61480000000000
1982-01-01	89.61480000000000
1983-01-01	89.61480000000000
1984-01-01	89.61480000000000
1985-01-01	89.61480000000000
1986-01-01	89.61480000000000
1987-01-01	89.61480000000000
1988-01-01	89.61480000000000
1989-01-01	89.61480000000000
1990-01-01	89.61480000000000
1991-01-01	89.61480000000000
1992-01-01	89.61480000000000
1993-01-01	89.61480000000000
1994-01-01	89.61480000000000
1995-01-01	89.61480000000000
1996-01-01	89.61480000000000
1997-01-01	89.61480000000000
1998-01-01	89.61480000000000
1999-01-01	89.61480000000000
2000-01-01	89.61480000000000
2001-01-01	89.61480000000000
2002-01-01	89.61480000000000
2003-01-01	89.61480000000000
2004-01-01	22.26820000000000
2005-01-01	31.93720000000000
2006-01-01	43.49880000000000
2007-01-01	47.65980000000000
2008-01-01	57.63130000000000
2009-01-01	66.48110000000000
2010-01-01	75.20470000000000
2011-01-01	83.55740000000000
2012-01-01	89.22420000000000
2013-01-01	91.57420000000000
2014-01-01	93.13390000000000
2015-01-01	88.35360000000000
2016-01-01	76.37850000000000