Year	Percent
1973-01-01	3.3879781417670600
1974-01-01	1.7970401682347700
1975-01-01	3.8421599179381300
1976-01-01	5.2283983330866200
1977-01-01	3.9088956956482400
1978-01-01	4.6871427485311200
1979-01-01	8.9764123470030000
1980-01-01	9.2858574392133900
1981-01-01	4.6614139439474900
1982-01-01	6.8358050825954400
1983-01-01	7.2798957327948900
1984-01-01	8.4678548764602400
1985-01-01	6.9423450187914200
1986-01-01	5.2916617007108900
1987-01-01	8.6743141773324600
1988-01-01	15.7235490703556000
1989-01-01	17.1491519973960000
1990-01-01	28.3695996532776000
1991-01-01	34.8175429072704000
1992-01-01	23.6557207806553000
1993-01-01	22.4642346133809000
1994-01-01	18.8680749869282000
1995-01-01	28.3054683706654000
1996-01-01	23.4690301919185000
1997-01-01	18.3050744143798000
1998-01-01	14.1537896545341000
1999-01-01	9.9977440930336400
2000-01-01	9.8036101690812700
2001-01-01	9.1168091168091300
2002-01-01	5.2654482158398600
2003-01-01	4.6610169491525600
2004-01-01	6.7443467956946300
2005-01-01	3.5615171137835500
2006-01-01	3.9303260384100000
2007-01-01	7.9587451654490900
2008-01-01	6.0425125388106000
2009-01-01	4.2117117117117200
2010-01-01	4.8555579569195100
2011-01-01	3.9299209893507500
2012-01-01	5.6521451708865100
2013-01-01	1.7331998498310700
2014-01-01	-0.2275662709883840
2015-01-01	-0.0616446800641176
2016-01-01	0.3947693066864020
2017-01-01	2.3482428115015900