Year	Percent
1986-01-01	4.23291648703416
1987-01-01	4.26142551321029
1988-01-01	5.83358403266303
1989-01-01	7.35909962942255
1990-01-01	8.05226276847262
1991-01-01	10.72471171100780
1992-01-01	10.78936611280550
1993-01-01	9.90048872152884
1994-01-01	8.45635169059048
1995-01-01	6.53053985389401
1996-01-01	6.37618775517863
1997-01-01	6.92825935425764
1998-01-01	7.81302927306618
1999-01-01	7.12698176282723
2000-01-01	6.21807430667724
2001-01-01	5.53438524642560
2002-01-01	5.36562843565463
2003-01-01	4.83503797132540
2004-01-01	4.09179482843895
2005-01-01	3.87504979904428
2006-01-01	3.91234632283156
2007-01-01	3.68115396973166
2008-01-01	4.19738682274822
2009-01-01	6.12020621715993
2010-01-01	6.33835743025168
2011-01-01	6.28897945992022
2012-01-01	6.65466712793348
2013-01-01	5.99405339535226
2014-01-01	5.59213350405866
2015-01-01	5.59445898125299
2016-01-01	5.35056421381651
2017-01-01	4.93424206311802