Year	Percent
1989-01-01	2.4180099999999998
1990-01-01	2.4705300000000000
1991-01-01	2.5151200000000000
1992-01-01	3.0452300000000000
1993-01-01	2.4633200000000000
1994-01-01	3.6623900000000003
1995-01-01	4.1512600000000000
1996-01-01	4.5854099999999995
1997-01-01	11.1181000000000000
1998-01-01	27.8851000000000000
1999-01-01	33.8103000000000000
2000-01-01	37.1684000000000000
2001-01-01	33.7477000000000000
2002-01-01	19.1490000000000000
2003-01-01	15.4715000000000000
2004-01-01	16.7292000000000000
2005-01-01	18.4396000000000000
2006-01-01	24.4629000000000000
2007-01-01	43.5096000000000000
2008-01-01	43.0412000000000000
2009-01-01	23.9095000000000000
2010-01-01	20.1850000000000000
2011-01-01	18.9611000000000000
2012-01-01	13.8178000000000000
2013-01-01	14.6309999999999980
2014-01-01	18.6017000000000000