Year	Percent
1980-01-01	12.2208000000000000
1981-01-01	11.2740000000000010
1982-01-01	15.7815000000000000
1983-01-01	10.4590000000000010
1984-01-01	10.7381000000000000
1985-01-01	7.8863300000000000
1986-01-01	9.7804100000000000
1987-01-01	5.6043100000000000
1988-01-01	6.1214400000000000
1989-01-01	5.0275200000000000
1990-01-01	4.2794200000000000
1991-01-01	3.6356300000000004
1992-01-01	3.8744199999999998
1993-01-01	2.8971400000000003
1994-01-01	2.0062400000000000
1995-01-01	4.3707600000000000
1996-01-01	6.3668400000000000
1997-01-01	7.4314700000000000
1998-01-01	8.0509899999999990
1999-01-01	8.4046200000000000
2000-01-01	10.7047000000000000
2001-01-01	13.0049000000000000
2002-01-01	10.7754000000000000
2003-01-01	7.6114100000000000
2004-01-01	8.4158400000000000
2005-01-01	12.0976000000000000
2006-01-01	14.7476000000000000
2007-01-01	15.0366000000000000
2008-01-01	17.4535000000000000
2009-01-01	21.6534000000000000
2010-01-01	24.8075000000000000
2011-01-01	28.5380000000000000
2012-01-01	26.7069000000000000
2013-01-01	26.5691000000000000
2014-01-01	29.1336000000000000