Year	Percent
1960-01-01	5.411830000000000
1961-01-01	5.747590000000000
1962-01-01	5.978510000000000
1963-01-01	7.083620000000000
1964-01-01	7.547900000000000
1965-01-01	8.280520000000000
1966-01-01	8.433860000000001
1967-01-01	9.373710000000000
1968-01-01	9.446470000000000
1969-01-01	10.062900000000000
1970-01-01	11.085700000000000
1971-01-01	11.617200000000000
1972-01-01	11.937300000000000
1973-01-01	14.687000000000001
1974-01-01	14.223500000000000
1975-01-01	12.344900000000000
1976-01-01	13.871800000000000
1977-01-01	17.887600000000000
1978-01-01	18.639800000000000
1979-01-01	19.180900000000000
1980-01-01	21.992300000000000
1981-01-01	21.902700000000000
1982-01-01	23.239600000000000
1983-01-01	26.132800000000000
1984-01-01	25.317500000000000
1985-01-01	24.932600000000000
1986-01-01	26.119300000000000
1987-01-01	27.063000000000002
1988-01-01	27.103000000000000
1989-01-01	28.370500000000000
1990-01-01	29.401800000000000
1991-01-01	30.773400000000000
1992-01-01	30.709200000000000
1993-01-01	32.453900000000000
1994-01-01	33.635500000000000
1995-01-01	35.572800000000000
1996-01-01	35.890400000000000
1997-01-01	37.737900000000000
1998-01-01	42.908900000000000
1999-01-01	43.564300000000000
2000-01-01	46.846900000000000
2001-01-01	47.290300000000000
2002-01-01	49.802500000000000
2003-01-01	50.367700000000000
2004-01-01	50.857700000000000
2005-01-01	51.998500000000000
2006-01-01	53.090800000000000
2007-01-01	56.053700000000000
2008-01-01	60.948300000000000
2009-01-01	67.844800000000000
2010-01-01	70.222600000000000
2011-01-01	70.437800000000000
2012-01-01	73.878500000000000
2013-01-01	77.853100000000000
2014-01-01	79.599400000000000
2015-01-01	87.558900000000000
2016-01-01	100.891000000000000