Year	Percent
1960-01-01	11.5451000000000000
1961-01-01	11.1117000000000000
1962-01-01	10.6222000000000000
1963-01-01	8.3336600000000000
1964-01-01	6.2669900000000000
1965-01-01	6.3537700000000000
1966-01-01	5.7391100000000000
1967-01-01	4.9747600000000000
1968-01-01	4.0587400000000000
1969-01-01	3.2794600000000000
1970-01-01	2.8644300000000000
1971-01-01	2.3759300000000000
1972-01-01	3.6095400000000000
1973-01-01	4.2304300000000000
1974-01-01	4.4095200000000000
1975-01-01	5.8611000000000000
1976-01-01	6.0519500000000000
1977-01-01	5.6341000000000000
1978-01-01	5.2134700000000000
1979-01-01	4.5260700000000000
1980-01-01	3.7878500000000000
1981-01-01	3.6316000000000000
1982-01-01	3.9549300000000005
1983-01-01	3.8599699999999997
1984-01-01	3.5808100000000000
1985-01-01	3.1702000000000000
1986-01-01	2.7395800000000000
1987-01-01	2.3582600000000000
1988-01-01	2.1989400000000003
1989-01-01	2.0662400000000000
1990-01-01	1.5818200000000000
1991-01-01	1.2511100000000000
1992-01-01	1.1070700000000000
1993-01-01	0.9969969999999999
1994-01-01	0.8916050000000000
1995-01-01	0.6744140000000001
1996-01-01	0.5375580000000000
1997-01-01	0.9747889999999999
1998-01-01	2.1748800000000000
1999-01-01	2.0272900000000003
2000-01-01	1.2697000000000000
2001-01-01	1.1225399999999999
2002-01-01	1.0171700000000001
2003-01-01	0.9261120000000000
2004-01-01	0.6931520000000000
2005-01-01	0.6423020000000000
2006-01-01	0.9004770000000001
2007-01-01	1.1111900000000000
2008-01-01	1.2334300000000000
2009-01-01	1.2668500000000000
2010-01-01	1.2446700000000002
2011-01-01	1.2289800000000000
2012-01-01	1.3660900000000000
2013-01-01	1.4893600000000000
2014-01-01	1.4806200000000000
2015-01-01	1.3695500000000000
2016-01-01	1.1334200000000000