Year	Percent
1983-01-01	14.5121000000000000
1984-01-01	11.5141000000000000
1985-01-01	13.9767000000000000
1986-01-01	14.5813000000000000
1987-01-01	18.7006000000000000
1988-01-01	15.0396000000000000
1989-01-01	15.0404000000000000
1990-01-01	17.4248000000000000
1991-01-01	16.4699000000000000
1992-01-01	14.0868000000000000
1993-01-01	12.8541000000000000
1994-01-01	7.2177899999999990
1995-01-01	5.4472300000000000
1996-01-01	7.1519699999999995
1997-01-01	9.5237900000000000
1998-01-01	12.9478000000000000
1999-01-01	16.8049000000000000
2000-01-01	29.6452000000000000
2001-01-01	35.1921000000000000
2002-01-01	38.0790000000000000
2003-01-01	39.0314000000000000
2004-01-01	44.2421000000000000
2005-01-01	40.4393000000000000
2006-01-01	42.1740000000000000
2007-01-01	57.5473000000000000
2008-01-01	51.6474000000000000
2009-01-01	67.0293000000000000
2010-01-01	61.4511000000000000
2011-01-01	52.7826000000000000
2012-01-01	59.1920000000000000
2013-01-01	61.5759000000000000
2014-01-01	53.8431000000000000
2015-01-01	56.1819000000000000
2016-01-01	48.7296000000000000