Year	Percent
1984-01-01	38.3133
1985-01-01	39.3302
1986-01-01	43.5093
1987-01-01	43.6300
1988-01-01	46.3175
1989-01-01	47.5405
1990-01-01	46.6611
1991-01-01	44.0065
1992-01-01	41.6367
1993-01-01	41.1353
1994-01-01	39.6597
1995-01-01	43.3645
1996-01-01	46.3495
1997-01-01	45.8488
1998-01-01	46.9724
1999-01-01	30.9975
2000-01-01	31.9872
2001-01-01	30.1758
2002-01-01	26.8544
2003-01-01	25.0685
2004-01-01	23.2039
2005-01-01	21.8219
2006-01-01	21.1306
2007-01-01	22.2210
2008-01-01	24.6714
2009-01-01	29.3721
2010-01-01	34.1269
2011-01-01	33.4675
2012-01-01	31.7748
2013-01-01	32.7727
2014-01-01	33.1398
2015-01-01	33.1868
2016-01-01	32.8496