Year	Percent
1973-01-01	9.173230000000000
1974-01-01	12.067000000000000
1975-01-01	16.683500000000000
1976-01-01	20.465700000000000
1977-01-01	18.937700000000000
1978-01-01	17.167500000000000
1979-01-01	15.203600000000000
1980-01-01	13.931900000000000
1981-01-01	15.925999999999998
1982-01-01	20.419800000000000
1983-01-01	24.860100000000000
1984-01-01	29.815700000000000
1985-01-01	35.321700000000000
1986-01-01	46.969200000000000
1987-01-01	44.895700000000000
1988-01-01	46.680400000000000
1989-01-01	43.390200000000000
1990-01-01	33.626300000000000
1991-01-01	34.023400000000000
1992-01-01	35.468900000000000
1993-01-01	35.154500000000000
1994-01-01	33.720300000000000
1995-01-01	33.213100000000000
1996-01-01	32.290600000000000
1997-01-01	32.485500000000000
1998-01-01	35.911100000000000
1999-01-01	34.319500000000000
2000-01-01	31.066500000000000
2001-01-01	37.349100000000000
2002-01-01	40.923800000000000
2003-01-01	40.976300000000000
2004-01-01	41.353700000000000
2005-01-01	43.152000000000000
2006-01-01	48.949700000000000
2007-01-01	50.939700000000000
2008-01-01	55.871200000000000
2009-01-01	75.600200000000000
2010-01-01	71.463000000000010
2011-01-01	62.303200000000000
2012-01-01	61.248300000000000
2013-01-01	66.856100000000000
2014-01-01	74.212300000000000
2015-01-01	89.886000000000010
2016-01-01	94.860400000000000