Year	Percent
1985-01-01	34.0116
1986-01-01	50.3591
1987-01-01	53.1169
1988-01-01	32.8652
1989-01-01	29.5941
1990-01-01	25.0163
1991-01-01	26.4144
1992-01-01	34.6851
1993-01-01	44.6129
1994-01-01	50.3623
1995-01-01	47.8005
1996-01-01	50.9200
1997-01-01	49.4952
1998-01-01	44.8844
1999-01-01	44.9018
2000-01-01	40.8610
2001-01-01	33.1518
2002-01-01	32.2477
2003-01-01	33.9854
2004-01-01	38.6796
2005-01-01	37.9116
2006-01-01	37.0850
2007-01-01	35.9715
2008-01-01	26.5332
2009-01-01	23.5596
2010-01-01	28.8538
2011-01-01	27.3906
2012-01-01	27.8717
2013-01-01	31.3615
2014-01-01	35.2037
2015-01-01	38.6286
2016-01-01	40.7547