Year	Percent
1977-01-01	28.7087000000000000
1978-01-01	32.9497000000000000
1979-01-01	57.6500000000000000
1980-01-01	35.0067000000000000
1981-01-01	10.5971000000000000
1982-01-01	32.7218000000000000
1983-01-01	21.6143000000000000
1984-01-01	38.4757000000000000
1985-01-01	42.5299000000000000
1986-01-01	16.2285000000000000
1987-01-01	13.7127000000000000
1988-01-01	295.5930000000000000
1989-01-01	24.3665000000000000
1990-01-01	41.1398000000000000
1991-01-01	44.4025000000000000
1992-01-01	86.0864000000000000
1993-01-01	159.1910000000000000
1994-01-01	279.0060000000000000
1995-01-01	85.4739999999999900
1996-01-01	75.9092000000000000
1997-01-01	73.5137000000000000
1998-01-01	49.8438000000000000
1999-01-01	23.4476000000000000
2000-01-01	17.9878000000000000
2001-01-01	16.8183000000000000
2002-01-01	8.6537899999999990
2003-01-01	11.0580000000000000
2004-01-01	12.0425000000000000
2005-01-01	11.8965000000000000
2006-01-01	7.0177600000000010
2007-01-01	9.0027700000000000
2008-01-01	6.9648100000000010
2009-01-01	3.7975900000000000
2010-01-01	4.7293800000000000
2011-01-01	4.6939199999999990
2012-01-01	4.0997900000000005
2013-01-01	5.5661000000000000
2014-01-01	7.2505899999999990
2015-01-01	4.9813199999999990
2016-01-01	8.5772000000000000
2017-01-01	7.9709000000000000