Year	Percent
1983-01-01	7.3010399999999995
1984-01-01	7.3190399999999990
1985-01-01	5.5784100000000000
1986-01-01	4.5073000000000000
1987-01-01	5.5835599999999990
1988-01-01	4.7495400000000005
1989-01-01	5.1690000000000000
1990-01-01	7.1653199999999995
1991-01-01	4.4247800000000000
1992-01-01	3.8960800000000004
1993-01-01	3.9060300000000003
1994-01-01	4.1431900000000000
1995-01-01	7.3364600000000010
1996-01-01	8.3078500000000000
1997-01-01	13.3097000000000000
1998-01-01	13.1491000000000000
1999-01-01	15.7405000000000000
2000-01-01	16.4533000000000000
2001-01-01	16.1952000000000000
2002-01-01	15.6779999999999990
2003-01-01	15.7443000000000000
2004-01-01	15.9131000000000000
2005-01-01	22.9791000000000000
2006-01-01	27.3844000000000000
2007-01-01	39.2641000000000000
2008-01-01	41.8507000000000000
2009-01-01	39.1462000000000000
2010-01-01	36.2306000000000000
2011-01-01	34.1803000000000000
2012-01-01	29.0843000000000000
2013-01-01	30.2498000000000000
2014-01-01	27.5467000000000000
2015-01-01	25.6402000000000000
2016-01-01	21.2845000000000000