Year	Percent
1976-01-01	9.090530000000001
1977-01-01	31.387200000000000
1978-01-01	44.025400000000000
1979-01-01	40.829500000000000
1980-01-01	30.191500000000000
1981-01-01	54.637100000000000
1982-01-01	128.810000000000000
1983-01-01	173.614000000000000
1984-01-01	189.015000000000000
1985-01-01	188.695000000000000
1986-01-01	149.119000000000000
1987-01-01	109.758000000000000
1988-01-01	85.591000000000010
1989-01-01	75.432800000000000
1990-01-01	82.034700000000000
1991-01-01	74.495500000000000
1992-01-01	63.603300000000000
1993-01-01	63.491200000000000
1994-01-01	64.405200000000000
1995-01-01	66.467500000000000
1996-01-01	59.613900000000000
1997-01-01	56.513900000000000
1998-01-01	58.536600000000000
1999-01-01	58.048200000000000
2000-01-01	59.160900000000000
2001-01-01	64.592500000000000
2002-01-01	65.589700000000000
2003-01-01	60.994900000000000
2004-01-01	69.267400000000000
2005-01-01	83.016500000000000
2006-01-01	107.642999999999990
2007-01-01	129.462000000000020
2008-01-01	145.632999999999980
2009-01-01	138.434000000000000
2010-01-01	115.967999999999990
2011-01-01	99.915200000000000
2012-01-01	87.470900000000000
2013-01-01	75.245400000000000
2014-01-01	65.392000000000000
2015-01-01	60.968300000000000
2016-01-01	63.751900000000000