Year	Percent
1974-01-01	13.42283451659240
1975-01-01	14.21193968194260
1976-01-01	11.41255199841360
1977-01-01	16.68831168855520
1978-01-01	13.48357901184890
1979-01-01	16.00355239774780
1980-01-01	16.27484161825330
1981-01-01	12.41326137239800
1982-01-01	12.13991769547340
1983-01-01	17.49235474006140
1984-01-01	10.98386257157740
1985-01-01	13.32082551594710
1986-01-01	18.00496688741720
1987-01-01	11.75026306559100
1988-01-01	11.45637162586320
1989-01-01	14.72824556462970
1990-01-01	11.63475699558180
1991-01-01	17.67810026385220
1992-01-01	17.20852017937210
1993-01-01	13.13566076837240
1994-01-01	8.21473862195302
1995-01-01	9.27083333333324
1996-01-01	9.33031458531934
2000-01-01	6.13197538722697
2001-01-01	-9.61615353858473
2002-01-01	33.81257833812600
2003-01-01	6.62916357146763
2004-01-01	5.02342068616283
2005-01-01	3.43788423057440
2006-01-01	6.07271879734298
2007-01-01	8.01243669043408
2008-01-01	10.71566613096810
2009-01-01	7.37943935240860
2010-01-01	3.59826152433110
2011-01-01	4.99459789109589
2012-01-01	6.12268927253408
2013-01-01	4.97576820829645
2014-01-01	5.31828186171233
2015-01-01	3.16030981944370
2016-01-01	6.60505665048206
2017-01-01	5.31027255006863