Year	Percent
1981-01-01	5.075840000000000
1982-01-01	4.393269999999999
1983-01-01	5.424910000000000
1984-01-01	49.056400000000000
1985-01-01	50.974700000000000
1986-01-01	13.987600000000000
1987-01-01	12.326600000000000
1988-01-01	13.899800000000000
1989-01-01	19.632900000000000
1990-01-01	22.730999999999998
1991-01-01	19.515900000000000
1992-01-01	15.676600000000000
1993-01-01	17.901700000000000
1994-01-01	25.171200000000000
1995-01-01	28.189900000000000
1996-01-01	30.739200000000000
1997-01-01	36.804700000000000
1998-01-01	35.468500000000000
1999-01-01	33.431000000000000
2000-01-01	35.756700000000000
2001-01-01	38.758600000000000
2002-01-01	36.382300000000000
2003-01-01	36.961000000000000
2004-01-01	45.815700000000000
2005-01-01	54.942800000000000
2006-01-01	68.633200000000000
2007-01-01	81.428400000000000
2008-01-01	55.869300000000000
2009-01-01	46.199400000000000
2010-01-01	61.897000000000000
2011-01-01	54.026500000000000
2012-01-01	44.570700000000000
2013-01-01	48.421700000000000
2014-01-01	46.905200000000000
2015-01-01	47.331200000000000
2016-01-01	56.647100000000000
2017-01-01	65.547200000000000