Year	Percent of Total
1960-01-01	4.96351680028826
1961-01-01	4.95390948726960
1962-01-01	4.91983700826383
1963-01-01	4.86312725526823
1964-01-01	4.78823533745676
1965-01-01	4.69581392666080
1966-01-01	4.66215931589368
1967-01-01	4.60980098146129
1968-01-01	4.54350877542284
1969-01-01	4.47535046843417
1970-01-01	4.41446584995840
1971-01-01	4.45956786644832
1972-01-01	4.48553411829041
1973-01-01	4.48649745036848
1974-01-01	4.43869559730687
1975-01-01	4.32189784675088
1976-01-01	4.37401365615360
1977-01-01	4.38670812438938
1978-01-01	4.36427592694848
1979-01-01	4.30390403030622
1980-01-01	4.20287868403016
1981-01-01	4.15754842388628
1982-01-01	4.12811363409573
1983-01-01	4.11288655696001
1984-01-01	4.11640825115503
1985-01-01	4.14326155766573
1986-01-01	4.12606642129226
1987-01-01	4.11714803433349
1988-01-01	4.11457375362268
1989-01-01	4.11263878224167
1990-01-01	4.10593047609677
1991-01-01	4.09419368895022
1992-01-01	4.06746816420153
1993-01-01	4.03306347081447
1994-01-01	3.99802931395492
1995-01-01	3.96635972357295
1996-01-01	3.92157236941292
1997-01-01	3.87561600775564
1998-01-01	3.82742781110094
1999-01-01	3.77531198193708
2000-01-01	3.72068114005173
2001-01-01	3.66620712077304
2002-01-01	3.60875561031022
2003-01-01	3.55134024655527
2004-01-01	3.49495113939105
2005-01-01	3.43924670910596
2006-01-01	3.38215413201181
2007-01-01	3.32715563342325
2008-01-01	3.27319332395229
2009-01-01	3.21720889968332
2010-01-01	3.15980166206850
2011-01-01	3.10020215430106
2012-01-01	3.03670446459778
2013-01-01	2.97661998291112
2014-01-01	2.92715578914562
2015-01-01	2.89146827135527
2016-01-01	2.86641724451285
2017-01-01	2.84565062882142