Year	Percent
1960-01-01	1.8848400000000000
1961-01-01	1.8393800000000000
1962-01-01	1.7935500000000000
1963-01-01	2.1138800000000000
1964-01-01	2.1495900000000003
1965-01-01	2.1579200000000003
1966-01-01	2.1395100000000000
1967-01-01	2.5208200000000000
1968-01-01	2.6486400000000003
1969-01-01	3.0456600000000000
1970-01-01	3.9103700000000000
1971-01-01	4.7958000000000000
1972-01-01	5.6047900000000000
1973-01-01	7.3434000000000000
1974-01-01	7.0993699999999995
1975-01-01	6.4672300000000010
1976-01-01	7.9607500000000000
1977-01-01	10.6622000000000000
1978-01-01	11.3159999999999990
1979-01-01	11.7689000000000000
1980-01-01	13.6206000000000000
1981-01-01	13.9615000000000000
1982-01-01	15.1994000000000000
1983-01-01	17.4450000000000000
1984-01-01	16.8712000000000000
1985-01-01	16.7083000000000000
1986-01-01	17.5507000000000000
1987-01-01	17.9447000000000000
1988-01-01	18.2808000000000000
1989-01-01	19.6041000000000000
1990-01-01	20.3265000000000000
1991-01-01	20.9113000000000000
1992-01-01	20.9531000000000000
1993-01-01	22.4970000000000000
1994-01-01	23.3512000000000000
1995-01-01	24.8825000000000000
1996-01-01	25.4519999999999980
1997-01-01	25.6358000000000000
1998-01-01	29.9146000000000000
1999-01-01	32.5045000000000000
2000-01-01	35.2272000000000000
2001-01-01	35.7609999999999960
2002-01-01	37.8309000000000000
2003-01-01	38.6046000000000000
2004-01-01	39.2509000000000000
2005-01-01	40.1944000000000000
2006-01-01	41.3481000000000000
2007-01-01	44.4524000000000000
2008-01-01	48.7128000000000000
2009-01-01	55.3463000000000000
2010-01-01	58.4283000000000000
2011-01-01	59.1524000000000000
2012-01-01	62.3145000000000000
2013-01-01	65.5465000000000000
2014-01-01	67.3665000000000000
2015-01-01	73.2119000000000000
2016-01-01	84.4024000000000000