Year	Percent
1966-01-01	0.13777000000000000
1967-01-01	0.25908000000000003
1968-01-01	0.24114499999999997
1969-01-01	0.22086799999999998
1970-01-01	0.19514700000000001
1971-01-01	0.17918699999999999
1972-01-01	0.59837900000000000
1973-01-01	1.11806000000000000
1974-01-01	2.98955000000000000
1975-01-01	4.36354000000000000
1976-01-01	5.81936999999999900
1977-01-01	8.21793999999999900
1978-01-01	10.27040000000000000
1979-01-01	10.03010000000000000
1980-01-01	9.82099000000000000
1981-01-01	12.54180000000000000
1982-01-01	12.92590000000000000
1983-01-01	12.51920000000000000
1984-01-01	13.12490000000000000
1985-01-01	16.50030000000000000
1986-01-01	16.23350000000000000
1987-01-01	18.22440000000000000
1988-01-01	18.36670000000000000
1989-01-01	19.80910000000000000
1990-01-01	19.44390000000000000
1991-01-01	20.42420000000000000
1992-01-01	19.01440000000000000
1993-01-01	21.15980000000000000
1994-01-01	23.77670000000000000
1995-01-01	23.66510000000000000
1996-01-01	24.00450000000000000
1997-01-01	25.88510000000000000
1998-01-01	30.58970000000000000
1999-01-01	32.40180000000000000
2000-01-01	39.03310000000000000
2001-01-01	43.70170000000000000
2002-01-01	54.08010000000000000
2003-01-01	60.95860000000000000
2004-01-01	64.25230000000000000
2005-01-01	64.59420000000000000
2006-01-01	77.95930000000000000
2007-01-01	86.41530000000000000
2008-01-01	80.75120000000000000
2009-01-01	90.63220000000000000
2010-01-01	87.11290000000000000
2011-01-01	76.35340000000000000
2012-01-01	78.11730000000000000
2013-01-01	76.32060000000000000
2014-01-01	62.77440000000000000
2015-01-01	63.97770000000000000
2016-01-01	59.43780000000000000