Year	Percent of Total
1960-01-01	4.66283137525486
1961-01-01	4.80805715213449
1962-01-01	4.96791736463530
1963-01-01	5.14441842973397
1964-01-01	5.33999536691799
1965-01-01	5.55585067372836
1966-01-01	5.72346594412551
1967-01-01	5.89909062361815
1968-01-01	6.08597351823848
1969-01-01	6.28388540921215
1970-01-01	6.49166801772305
1971-01-01	6.71849865221401
1972-01-01	6.94256477259468
1973-01-01	7.16944960413232
1974-01-01	7.41059828131140
1975-01-01	7.67085436171616
1976-01-01	7.87664718595522
1977-01-01	8.10427350962522
1978-01-01	8.32980941931090
1979-01-01	8.51827781140212
1980-01-01	8.65489508145851
1981-01-01	8.69671883649540
1982-01-01	8.68059391260438
1983-01-01	8.63651587558160
1984-01-01	8.60442764551944
1985-01-01	8.60419610427877
1986-01-01	8.64756976832188
1987-01-01	8.70816917403175
1988-01-01	8.77847671811008
1989-01-01	8.84522352774810
1990-01-01	8.90208255795221
1991-01-01	9.03131850074022
1992-01-01	9.18232561660170
1993-01-01	9.35209002893100
1994-01-01	9.54007222508706
1995-01-01	9.74768262070049
1996-01-01	9.79652800060932
1997-01-01	9.84614521346189
1998-01-01	9.89663863068301
1999-01-01	9.95054117862714
2000-01-01	10.01223697528710
2001-01-01	10.01290474147280
2002-01-01	10.01856783269240
2003-01-01	10.02570430925560
2004-01-01	10.02566616791580
2005-01-01	10.01761328614240
2006-01-01	10.05785015449550
2007-01-01	10.09172019238200
2008-01-01	10.14629280258570
2009-01-01	10.25814214432100
2010-01-01	10.44724324494650
2011-01-01	10.53273621328900
2012-01-01	10.66279781870750
2013-01-01	10.83034941993490
2014-01-01	11.02088831730810
2015-01-01	11.22370543565560
2016-01-01	11.46993076514790
2017-01-01	11.73329071317070