Year	Percent
1975-01-01	2.872420000000000
1976-01-01	2.845340000000000
1977-01-01	2.987620000000000
1978-01-01	3.737770000000000
1979-01-01	5.720820000000000
1980-01-01	8.225840000000000
1981-01-01	8.333370000000000
1982-01-01	6.433530000000000
1983-01-01	6.540830000000001
1984-01-01	7.372039999999999
1985-01-01	8.625770000000000
1986-01-01	12.637300000000000
1987-01-01	17.756400000000000
1988-01-01	16.812300000000000
1989-01-01	14.315300000000000
1990-01-01	13.486500000000000
1991-01-01	11.885900000000000
1992-01-01	12.282100000000000
1993-01-01	17.688600000000000
1994-01-01	24.257500000000000
1995-01-01	28.185800000000000
1996-01-01	35.769900000000000
1997-01-01	46.008999999999990
1998-01-01	53.419400000000000
1999-01-01	55.565000000000000
2000-01-01	68.687800000000000
2001-01-01	71.776500000000000
2002-01-01	59.066000000000000
2003-01-01	56.861100000000000
2004-01-01	61.315400000000000
2005-01-01	72.541000000000000
2006-01-01	85.284100000000000
2007-01-01	104.695000000000000
2008-01-01	106.603000000000000
2009-01-01	100.119000000000000
2010-01-01	89.656000000000000
2011-01-01	82.797100000000000
2012-01-01	77.595900000000000
2013-01-01	71.918000000000000
2014-01-01	72.481600000000000
2015-01-01	73.048200000000000
2016-01-01	72.497800000000000
2017-01-01	75.014100000000000