Year	Percent
1972-01-01	6.877546130155340
1973-01-01	3.228699551352410
1974-01-01	18.853171155598900
1975-01-01	10.069444444664100
1976-01-01	4.255319148936030
1977-01-01	8.616780045351520
1978-01-01	6.263048016701560
1979-01-01	8.055009823182690
1980-01-01	13.090909090909000
1981-01-01	16.398713826366500
1982-01-01	12.983425414364800
1983-01-01	6.234718826405810
1984-01-01	11.047180667433800
1985-01-01	9.568221070811420
1986-01-01	13.571878940731300
1987-01-01	10.992366412213500
1988-01-01	16.737526572465400
1989-01-01	14.932247871030100
1990-01-01	8.737592618481820
1991-01-01	15.050130775937000
1992-01-01	10.751160367528500
1993-01-01	9.168662333219870
1994-01-01	13.256032591663800
1995-01-01	9.629219701162300
1996-01-01	11.774356385663600
1997-01-01	8.084001354860470
1998-01-01	12.399503812806900
1999-01-01	8.020368392968400
2000-01-01	7.889561869867230
2001-01-01	6.925837320574240
2002-01-01	10.929634187269200
2003-01-01	8.269463493344040
2004-01-01	6.985842026825680
2005-01-01	7.330663416332990
2006-01-01	11.219987021414600
2007-01-01	7.666020134848050
2008-01-01	17.320065196877400
2009-01-01	7.092717168762840
2010-01-01	1.051481633210400
2011-01-01	7.342707060180000
2012-01-01	5.912006024911560
2013-01-01	5.391363885875570
2014-01-01	5.165902379251740
2015-01-01	-0.574469286359565
2016-01-01	0.512485626268813
2017-01-01	0.488686760260995