Year	Percent
1978-01-01	192.38700000000000
1979-01-01	426.26199999999994
1980-01-01	251.47799999999998
1981-01-01	361.66100000000000
1982-01-01	84.22250000000000
1983-01-01	52.10990000000000
1984-01-01	62.06090000000000
1985-01-01	97.07130000000000
1986-01-01	124.21100000000000
1987-01-01	208.60700000000000
1988-01-01	71.21500000000000
1989-01-01	67.23220000000000
1990-01-01	57.64590000000000
1991-01-01	46.20480000000000
1992-01-01	36.89640000000000
1993-01-01	36.93310000000000
1994-01-01	35.91270000000000
1995-01-01	40.81210000000000
1996-01-01	46.56170000000000
1997-01-01	39.82330000000000
1998-01-01	23.98920000000000
1999-01-01	28.89720000000000
2000-01-01	31.50980000000000
2001-01-01	41.89550000000000
2002-01-01	22.41180000000000
2003-01-01	21.49990000000000
2004-01-01	30.80790000000000
2005-01-01	26.29420000000000
2006-01-01	28.06180000000000
2007-01-01	31.77990000000000
2008-01-01	27.03040000000000
2009-01-01	28.63220000000000
2010-01-01	26.77070000000000
2011-01-01	23.02130000000000
2012-01-01	26.40120000000000
2013-01-01	30.70020000000000
2014-01-01	26.00050000000000
2015-01-01	25.88400000000000
2016-01-01	32.46930000000000
2017-01-01	28.52490000000000