Year	Percent
1981-01-01	11.33651544151050
1982-01-01	12.31245087077360
1983-01-01	11.12664412214300
1984-01-01	11.37332209029370
1985-01-01	10.42384023038870
1986-01-01	6.80905593895123
1987-01-01	7.02827195245956
1988-01-01	6.93068617206519
1989-01-01	8.04615863487319
1990-01-01	6.80119760762573
1991-01-01	8.81964099733880
1992-01-01	9.52347719108987
1993-01-01	8.52787695688003
1994-01-01	32.29366685695510
1995-01-01	14.37880865164200
1996-01-01	7.41137173526642
1997-01-01	5.57225711125332
1998-01-01	6.20801608663320
1999-01-01	3.94327409481390
2000-01-01	4.16540442290281
2001-01-01	4.93944977668384
2002-01-01	3.89570525758491
2003-01-01	5.30238773219937
2004-01-01	4.47499289078105
2005-01-01	8.51673434919865
2006-01-01	6.69526465773351
2007-01-01	7.60315916084459
2008-01-01	11.30510988270190
2009-01-01	4.56158154742791
2010-01-01	4.69889064976229
2011-01-01	6.76227957314765
2012-01-01	6.31474450315182
2013-01-01	5.51827136955831
2014-01-01	4.48576293622033
2015-01-01	4.02917184654451
2016-01-01	4.77744170418787
2017-01-01	5.26421655571573