Year	Percent
1965-01-01	61.1195
1966-01-01	59.5194
1967-01-01	57.8061
1968-01-01	58.7181
1969-01-01	58.7282
1970-01-01	50.0008
1971-01-01	48.8057
1972-01-01	50.4286
1973-01-01	54.0718
1974-01-01	54.2100
1975-01-01	55.2963
1976-01-01	55.5324
1977-01-01	54.6886
1978-01-01	53.5299
1979-01-01	52.1796
1980-01-01	46.7829
1981-01-01	48.5734
1982-01-01	49.7857
1983-01-01	49.5939
1984-01-01	49.2912
1985-01-01	50.2473
1986-01-01	48.0210
1987-01-01	46.6834
1988-01-01	47.6689
1989-01-01	49.3862
1990-01-01	49.5376
1991-01-01	49.4988
1992-01-01	48.9027
1993-01-01	44.7717
1994-01-01	44.1320
1995-01-01	45.6445
1996-01-01	46.3467
1997-01-01	48.9824
1998-01-01	51.9369
1999-01-01	53.0537
2000-01-01	51.3546
2001-01-01	47.1078
2002-01-01	40.6965
2003-01-01	39.9422
2004-01-01	38.1059
2005-01-01	38.8032
2006-01-01	40.5455
2007-01-01	41.5416
2008-01-01	43.8976
2009-01-01	43.9386
2010-01-01	40.1603
2011-01-01	39.2790
2012-01-01	39.8809
2013-01-01	39.6673
2014-01-01	40.6368
2015-01-01	42.0735
2016-01-01	43.1176