Year	Percent of Total
1960-01-01	3.61693357259685
1961-01-01	3.63450967623079
1962-01-01	3.64845185312711
1963-01-01	3.65927981640638
1964-01-01	3.66958244141549
1965-01-01	3.67960165096385
1966-01-01	3.70127433513271
1967-01-01	3.72205748461579
1968-01-01	3.74187000795312
1969-01-01	3.76111004626548
1970-01-01	3.77976948579575
1971-01-01	3.80816510621419
1972-01-01	3.83385349482596
1973-01-01	3.85941439196350
1974-01-01	3.88702811408070
1975-01-01	3.91833624130116
1976-01-01	3.96276095437614
1977-01-01	4.00948914244052
1978-01-01	4.05796716927167
1979-01-01	4.10740663843483
1980-01-01	4.15844106221741
1981-01-01	4.21778175922293
1982-01-01	4.27592432217659
1983-01-01	4.33363070286186
1984-01-01	4.39207541067144
1985-01-01	4.45140667496968
1986-01-01	4.51063090734532
1987-01-01	4.56862951466831
1988-01-01	4.62755074900216
1989-01-01	4.68900276959079
1990-01-01	4.75449502612091
1991-01-01	4.81693544775424
1992-01-01	4.88253575867870
1993-01-01	4.95154477183984
1994-01-01	5.02383779347384
1995-01-01	5.10006460490632
1996-01-01	5.17801100293812
1997-01-01	5.25585497387647
1998-01-01	5.33655549786975
1999-01-01	5.42363902494517
2000-01-01	5.51949991205628
2001-01-01	5.61817972323383
2002-01-01	5.72397051375480
2003-01-01	5.83664207674623
2004-01-01	5.95493373534695
2005-01-01	6.07888087699466
2006-01-01	6.20777999383827
2007-01-01	6.33773108920099
2008-01-01	6.47137817709003
2009-01-01	6.61127540066240
2010-01-01	6.75975825793762
2011-01-01	6.90261725203909
2012-01-01	7.05034113998163
2013-01-01	7.20619352230138
2014-01-01	7.37333586749543
2015-01-01	7.55510677208711
2016-01-01	7.73078335071424
2017-01-01	7.91811909811845