Year	Percent
1960-01-01	19.074700000000000
1961-01-01	18.671600000000000
1962-01-01	20.852200000000000
1963-01-01	23.080800000000000
1964-01-01	23.828700000000000
1965-01-01	23.323500000000000
1966-01-01	23.913100000000000
1967-01-01	26.156900000000000
1968-01-01	27.770400000000000
1969-01-01	28.146400000000000
1970-01-01	27.896700000000000
1971-01-01	30.199700000000000
1972-01-01	32.015300000000000
1973-01-01	28.645100000000000
1974-01-01	30.723500000000000
1975-01-01	31.151300000000000
1976-01-01	31.052700000000000
1977-01-01	32.517500000000000
1978-01-01	37.521700000000000
1979-01-01	41.286400000000000
1980-01-01	41.422200000000000
1981-01-01	44.641000000000005
1982-01-01	46.787600000000000
1983-01-01	49.119100000000000
1984-01-01	49.118500000000000
1985-01-01	50.304500000000000
1986-01-01	52.720600000000000
1987-01-01	56.999800000000000
1988-01-01	56.839600000000000
1989-01-01	58.520300000000000
1990-01-01	58.424100000000000
1991-01-01	52.464500000000000
1992-01-01	49.491900000000000
1993-01-01	48.540400000000000
1994-01-01	49.284600000000000
1995-01-01	51.868400000000000
1996-01-01	53.598900000000000
1997-01-01	53.316700000000000
1998-01-01	51.708700000000000
1999-01-01	52.170500000000000
2000-01-01	53.931800000000000
2001-01-01	72.831800000000000
2002-01-01	86.841300000000000
2003-01-01	81.031500000000000
2004-01-01	80.252900000000000
2005-01-01	84.722000000000010
2006-01-01	84.410200000000000
2007-01-01	88.484000000000000
2008-01-01	97.821700000000000
2009-01-01	106.929000000000000
2010-01-01	109.827999999999990
2011-01-01	104.333000000000000
2012-01-01	101.111000000000000
2013-01-01	104.880000000000000
2014-01-01	108.185000000000000
2015-01-01	99.373500000000000
2016-01-01	89.820500000000000