Year	Percent of Total
1960-01-01	4.65180955128282
1961-01-01	4.72335004978171
1962-01-01	4.76636025814446
1963-01-01	4.80359668243298
1964-01-01	4.86876706819161
1965-01-01	4.97797202265160
1966-01-01	5.09620328391959
1967-01-01	5.26900921226795
1968-01-01	5.47293597408017
1969-01-01	5.67145923255496
1970-01-01	5.84781190122044
1971-01-01	6.05694884115048
1972-01-01	6.23095077171950
1973-01-01	6.38510984898516
1974-01-01	6.54746728874947
1975-01-01	6.73233993491722
1976-01-01	6.91994181640484
1977-01-01	7.13153939726073
1978-01-01	7.35597945176140
1979-01-01	7.56817073033530
1980-01-01	7.75506124597452
1981-01-01	7.96246499341930
1982-01-01	8.12697600946560
1983-01-01	8.26348011931292
1984-01-01	8.39636663815197
1985-01-01	8.53680391796520
1986-01-01	8.59040643535013
1987-01-01	8.65158190213862
1988-01-01	8.71715223052102
1989-01-01	8.78181671326463
1990-01-01	8.84725792592213
1991-01-01	8.91042740316694
1992-01-01	8.98583230623990
1993-01-01	9.06656253604388
1994-01-01	9.14515668970844
1995-01-01	9.21971424466234
1996-01-01	9.34749455615959
1997-01-01	9.45516258741275
1998-01-01	9.55929797072459
1999-01-01	9.68259777404221
2000-01-01	9.83709954212888
2001-01-01	10.02226604074790
2002-01-01	10.23475846581540
2003-01-01	10.46835072123900
2004-01-01	10.70936645536710
2005-01-01	10.95161549461890
2006-01-01	11.26132047736620
2007-01-01	11.56951709650130
2008-01-01	11.87589049240150
2009-01-01	12.18118633378930
2010-01-01	12.48719343096580
2011-01-01	12.75545148855740
2012-01-01	13.00823236672590
2013-01-01	13.26639366563770
2014-01-01	13.55934085021140
2015-01-01	13.90533922811740
2016-01-01	14.29107330422790
2017-01-01	14.73770696781330