Year	Percent
1983-01-01	41.0343000000000000
1984-01-01	46.2711000000000000
1985-01-01	45.4246000000000000
1986-01-01	43.1227000000000000
1987-01-01	53.9951000000000000
1988-01-01	41.4546000000000000
1989-01-01	54.5150000000000000
1990-01-01	39.5191000000000000
1991-01-01	33.6405000000000000
1992-01-01	30.4652000000000000
1993-01-01	28.2874000000000000
1994-01-01	23.6645000000000000
1995-01-01	15.8936000000000000
1996-01-01	16.2317000000000000
1997-01-01	21.7323000000000000
1998-01-01	20.0693000000000000
1999-01-01	20.5263000000000000
2000-01-01	19.6028000000000000
2001-01-01	17.4313000000000000
2002-01-01	19.7170000000000000
2003-01-01	22.4317000000000000
2004-01-01	17.8104000000000000
2005-01-01	16.5352000000000000
2006-01-01	16.1627000000000000
2007-01-01	14.5240000000000010
2008-01-01	10.5215000000000000
2009-01-01	7.4874300000000010
2010-01-01	5.4745000000000000
2011-01-01	9.5544100000000000
2012-01-01	10.7193000000000000
2013-01-01	12.1384000000000000
2014-01-01	7.6832199999999995
2015-01-01	1.5643799999999999