Year	Percent
1973-01-01	13.020600000000000
1974-01-01	9.628830000000000
1975-01-01	12.755999999999998
1976-01-01	17.806200000000000
1977-01-01	26.075800000000000
1978-01-01	32.037200000000000
1979-01-01	26.675500000000000
1980-01-01	30.545900000000000
1981-01-01	44.701800000000000
1982-01-01	65.705500000000000
1983-01-01	72.854700000000000
1984-01-01	69.890500000000000
1985-01-01	72.682900000000000
1986-01-01	92.380100000000000
1987-01-01	84.710200000000000
1988-01-01	101.191000000000000
1989-01-01	88.064800000000000
1990-01-01	88.064800000000000
1991-01-01	210.523000000000000
1992-01-01	121.526000000000010
1993-01-01	100.142999999999990
1994-01-01	96.371500000000000
1995-01-01	92.759400000000000
1996-01-01	83.039700000000000
1997-01-01	88.960500000000000
1998-01-01	110.249000000000000
1999-01-01	97.687100000000000
2000-01-01	76.949900000000000
2001-01-01	84.997200000000000
2002-01-01	83.488300000000000
2003-01-01	75.421900000000000
2004-01-01	68.419800000000000
2005-01-01	57.271400000000000
2006-01-01	53.188999999999990
2007-01-01	59.277200000000000
2008-01-01	60.822100000000000
2009-01-01	84.719600000000000
2010-01-01	79.635600000000000
2011-01-01	63.967900000000000
2012-01-01	57.864300000000000
2013-01-01	60.343600000000000
2014-01-01	68.769900000000000
2015-01-01	99.083200000000000
2016-01-01	109.598999999999990