Year	Percent of Total
1960-01-01	4.79126561158538
1961-01-01	4.85831965806506
1962-01-01	4.90922676895493
1963-01-01	4.94701673190933
1964-01-01	4.97599408267600
1965-01-01	4.99853952796291
1966-01-01	5.02824337163957
1967-01-01	5.04711122472513
1968-01-01	5.06016984549271
1969-01-01	5.07319974541073
1970-01-01	5.08997147073908
1971-01-01	5.14702177659150
1972-01-01	5.20605674464186
1973-01-01	5.26248490163966
1974-01-01	5.30967202282719
1975-01-01	5.34506427749649
1976-01-01	5.41604303254644
1977-01-01	5.47246024885340
1978-01-01	5.51920205533309
1979-01-01	5.56196577268469
1980-01-01	5.60360674461883
1981-01-01	5.67301189669437
1982-01-01	5.73780483815371
1983-01-01	5.79856773457911
1984-01-01	5.85484751859264
1985-01-01	5.90721078713554
1986-01-01	5.97387393585392
1987-01-01	6.03527273983268
1988-01-01	6.09592845669362
1989-01-01	6.16269392191511
1990-01-01	6.24002237706134
1991-01-01	6.33788017814049
1992-01-01	6.44502138207113
1993-01-01	6.55842954682774
1994-01-01	6.67326691499326
1995-01-01	6.78797838341151
1996-01-01	6.92776282457797
1997-01-01	7.06475438478894
1998-01-01	7.20037324631059
1999-01-01	7.33554102977843
2000-01-01	7.47157426503762
2001-01-01	7.60628914179109
2002-01-01	7.73697670228471
2003-01-01	7.87266491648935
2004-01-01	8.02458253770648
2005-01-01	8.19971977568182
2006-01-01	8.38270487761119
2007-01-01	8.58306369748589
2008-01-01	8.79626756592959
2009-01-01	9.01505231130064
2010-01-01	9.23699935869046
2011-01-01	9.44774833287735
2012-01-01	9.65986444861756
2013-01-01	9.88375295811449
2014-01-01	10.13387913271180
2015-01-01	10.41924358152920
2016-01-01	10.74068354037690
2017-01-01	11.08652659696970