Year	Percent
1981-01-01	9.93314231136587
1982-01-01	9.90443092962609
1983-01-01	18.02371541501980
1984-01-01	7.03281982585394
1985-01-01	1.87734668335429
1986-01-01	9.95085995086001
1987-01-01	6.36871508379867
1988-01-01	10.08403361344550
1989-01-01	8.77862595419861
1990-01-01	9.99999999999999
1991-01-01	12.28070175438580
1992-01-01	15.98011363636380
1993-01-01	11.20636864666240
1994-01-01	6.99339207048466
1995-01-01	9.49562532166745
1996-01-01	8.78965922444188
1997-01-01	6.51328580686976
1998-01-01	10.57702058614750
1999-01-01	6.77732942039609
2000-01-01	4.01099373013836
2001-01-01	3.41040462427740
2002-01-01	2.48343048790226
2003-01-01	1.56615240766714
2004-01-01	-18.10863013007150
2005-01-01	5.31151306345109
2006-01-01	5.00045438022542
2007-01-01	5.15611138758462
2008-01-01	8.32716049382714
2009-01-01	4.36112219119804
2010-01-01	7.03638316073017
2011-01-01	8.84898569946802
2012-01-01	10.91965694468300
2013-01-01	7.00666666666702
2014-01-01	8.27106093949345
2015-01-01	4.54814395082193
2016-01-01	4.31016875505535
2017-01-01	3.85820003539882