Year	Percent
1962-01-01	24.693700000000000
1963-01-01	26.045700000000000
1964-01-01	25.844600000000000
1965-01-01	28.016000000000000
1966-01-01	30.509400000000000
1967-01-01	32.578000000000000
1968-01-01	37.224000000000004
1969-01-01	38.700700000000000
1970-01-01	36.306000000000000
1971-01-01	28.390000000000000
1972-01-01	33.738900000000000
1973-01-01	31.873000000000000
1974-01-01	19.671200000000000
1975-01-01	23.615900000000000
1976-01-01	26.531100000000000
1977-01-01	33.950900000000000
1978-01-01	40.787600000000000
1979-01-01	31.014300000000000
1980-01-01	33.152600000000000
1981-01-01	49.000400000000000
1982-01-01	69.404200000000000
1983-01-01	77.729700000000000
1984-01-01	78.007100000000000
1985-01-01	79.422700000000000
1986-01-01	98.128900000000000
1987-01-01	83.166300000000000
1988-01-01	93.966900000000000
1989-01-01	80.753000000000000
1990-01-01	80.753000000000000
1991-01-01	191.187000000000000
1992-01-01	103.573000000000000
1993-01-01	85.623900000000000
1994-01-01	88.217800000000000
1995-01-01	86.340500000000000
1996-01-01	78.406800000000000
1997-01-01	80.924500000000000
1998-01-01	94.899700000000000
1999-01-01	82.590200000000000
2000-01-01	67.878300000000000
2001-01-01	80.474800000000000
2002-01-01	80.845300000000000
2003-01-01	70.193200000000000
2004-01-01	62.543400000000000
2005-01-01	52.358300000000000
2006-01-01	48.603100000000000
2007-01-01	52.812600000000000
2008-01-01	52.031900000000000
2009-01-01	76.362400000000000
2010-01-01	76.442200000000000
2011-01-01	62.815700000000000
2012-01-01	58.577700000000000
2013-01-01	62.457700000000000
2014-01-01	71.105500000000000
2015-01-01	98.330700000000000
2016-01-01	103.923999999999990