Year	Percent
1975-01-01	27.363000000000003
1976-01-01	22.780300000000000
1977-01-01	15.269300000000000
1978-01-01	10.510000000000000
1979-01-01	9.009630000000000
1980-01-01	7.163920000000000
1981-01-01	7.317250000000000
1982-01-01	6.570639999999999
1983-01-01	5.675470000000000
1984-01-01	6.691950000000000
1985-01-01	8.897490000000000
1986-01-01	14.517400000000000
1987-01-01	19.945400000000000
1988-01-01	22.123900000000000
1989-01-01	25.638000000000000
1990-01-01	23.940200000000000
1991-01-01	22.337900000000000
1992-01-01	21.412500000000000
1993-01-01	20.264800000000000
1994-01-01	25.314800000000000
1995-01-01	29.299000000000000
1996-01-01	33.541900000000000
1997-01-01	42.256300000000000
1998-01-01	55.586200000000000
1999-01-01	64.457800000000000
2000-01-01	73.543800000000000
2001-01-01	76.852900000000000
2002-01-01	67.782800000000000
2003-01-01	70.357400000000000
2004-01-01	81.223400000000000
2005-01-01	82.085700000000000
2006-01-01	90.591900000000000
2007-01-01	108.906000000000000
2008-01-01	88.803100000000000
2009-01-01	77.295500000000000
2010-01-01	88.169300000000000
2011-01-01	75.889200000000000
2012-01-01	72.612800000000000
2013-01-01	78.335800000000000
2014-01-01	76.340200000000000
2015-01-01	67.333100000000000
2016-01-01	59.480100000000000
2017-01-01	60.830600000000000