Year	Percent
1975-01-01	5.9752800000000010
1976-01-01	6.5087300000000000
1977-01-01	2.8713100000000000
1978-01-01	3.4894300000000005
1979-01-01	6.2571800000000000
1980-01-01	2.0102000000000000
1981-01-01	2.0102000000000000
1982-01-01	2.0102000000000000
1983-01-01	2.0102000000000000
1984-01-01	2.0102000000000000
1985-01-01	2.0102000000000000
1986-01-01	34.6744000000000000
1987-01-01	83.9011000000000000
1988-01-01	36.6400000000000000
1989-01-01	44.9678000000000000
1990-01-01	42.6587000000000000
1991-01-01	37.3107000000000000
1992-01-01	53.0830000000000000
1993-01-01	47.8780000000000000
1994-01-01	37.9879000000000000
1995-01-01	33.1119000000000000
1996-01-01	44.2108000000000000
1997-01-01	104.6150000000000000
1998-01-01	53.7145000000000000
1999-01-01	47.4551000000000000
2000-01-01	60.9392000000000000
2001-01-01	41.9281000000000000
2002-01-01	36.8309000000000000
2003-01-01	46.5129000000000000
2004-01-01	51.3752000000000000
2005-01-01	44.0237000000000000
2006-01-01	54.6257000000000000
2007-01-01	93.6558000000000000
2008-01-01	78.0755000000000000
2009-01-01	78.4894000000000000
2010-01-01	59.8922000000000000
2011-01-01	57.6185000000000000
2012-01-01	42.5136000000000000
2013-01-01	42.8017000000000000
2014-01-01	45.9473000000000000
2015-01-01	65.0027000000000000
2016-01-01	42.4767000000000000
2017-01-01	52.0210000000000000