Year	Percent
1984-01-01	9.22951819475498
1985-01-01	10.51897599371660
1986-01-01	4.12461526367688
1987-01-01	4.13301490809116
1988-01-01	8.03185935175041
1989-01-01	7.81730118223048
1990-01-01	7.00216956651126
1991-01-01	8.99846936747165
1992-01-01	10.04392794398360
1993-01-01	7.50539419087102
1994-01-01	32.29366685695510
1995-01-01	14.46254821808940
1996-01-01	7.83063091721077
1997-01-01	4.24818561130290
1998-01-01	5.41882401281192
1999-01-01	2.10633744083851
2000-01-01	3.60731123299650
2001-01-01	5.07745045522497
2002-01-01	3.53304214308075
2003-01-01	5.70700931874738
2004-01-01	3.99438400815970
2005-01-01	7.89036567462992
2006-01-01	7.25489556090276
2007-01-01	6.58201260129914
2008-01-01	11.30510988270190
2009-01-01	4.84533115255270
2010-01-01	4.39741383150069
2011-01-01	7.62282262848512
2012-01-01	6.74441688210980
2013-01-01	4.95687364932411
2014-01-01	4.40535234185290
2015-01-01	5.56642922109543
2016-01-01	5.85267266008288
2017-01-01	6.79912638744876