Year	Percent
1960-01-01	0.8193920000000000
1961-01-01	0.8791209999999999
1962-01-01	0.9580840000000000
1963-01-01	1.0620600000000000
1964-01-01	0.9572240000000000
1965-01-01	0.9016390000000000
1966-01-01	1.9543099999999998
1967-01-01	2.2194599999999998
1968-01-01	1.2065500000000000
1969-01-01	2.1723800000000000
1970-01-01	3.5181400000000003
1971-01-01	3.6444199999999998
1972-01-01	4.1900900000000005
1973-01-01	9.1786300000000000
1974-01-01	7.2963100000000010
1975-01-01	3.8068800000000005
1976-01-01	13.8641000000000000
1977-01-01	27.0284000000000000
1978-01-01	29.6145000000000000
1979-01-01	37.5372000000000000
1980-01-01	49.7600000000000000
1981-01-01	58.4023000000000000
1982-01-01	87.1076000000000000
1983-01-01	124.8300000000000000
1984-01-01	133.7900000000000000
1985-01-01	143.5580000000000000
1986-01-01	167.2400000000000000
1987-01-01	116.1439999999999900
1988-01-01	140.4489999999999800
1989-01-01	104.7239999999999900
1990-01-01	111.0550000000000000
1991-01-01	82.3827000000000000
1992-01-01	114.5370000000000000
1993-01-01	118.6150000000000000
1994-01-01	95.5092000000000000
1995-01-01	88.0018000000000000
1996-01-01	72.6808000000000000
1997-01-01	53.0811000000000000
1998-01-01	44.6727000000000000
1999-01-01	38.0015000000000000
2000-01-01	37.4564000000000000
2001-01-01	30.7972000000000000
2002-01-01	24.5093000000000000
2003-01-01	23.6739000000000000
2004-01-01	21.7968000000000000
2005-01-01	20.0932000000000000
2006-01-01	18.4865000000000000
2007-01-01	15.9192000000000000
2008-01-01	13.6354000000000000
2009-01-01	12.8054000000000000
2010-01-01	11.2076000000000000
2011-01-01	9.6994500000000000
2012-01-01	8.5490800000000000
2013-01-01	8.1394100000000000
2014-01-01	7.7258000000000000
2015-01-01	8.0464600000000000
2016-01-01	10.0149000000000000