Year	Percent of Total
1960-01-01	8.91769484027431
1961-01-01	9.01602155145048
1962-01-01	9.12000251478214
1963-01-01	9.22248429683419
1964-01-01	9.32163106684082
1965-01-01	9.41839546508869
1966-01-01	9.55331857573631
1967-01-01	9.68103024443249
1968-01-01	9.80906946494583
1969-01-01	9.93354329857266
1970-01-01	10.06353436578980
1971-01-01	10.23045723837200
1972-01-01	10.38900853477870
1973-01-01	10.54414870718000
1974-01-01	10.69198371480620
1975-01-01	10.83770115377710
1976-01-01	11.02929649899840
1977-01-01	11.22223850859520
1978-01-01	11.40272839579850
1979-01-01	11.54403638844820
1980-01-01	11.63143523409020
1981-01-01	11.69139257477880
1982-01-01	11.69320609592020
1983-01-01	11.67429951918150
1984-01-01	11.68570015555160
1985-01-01	11.75368357532440
1986-01-01	11.88596356781120
1987-01-01	12.06289535330990
1988-01-01	12.26725237204120
1989-01-01	12.47076146204180
1990-01-01	12.65704067077280
1991-01-01	12.84633729968130
1992-01-01	13.02017381291070
1993-01-01	13.18021076419640
1994-01-01	13.33015633756830
1995-01-01	13.47269518603650
1996-01-01	13.63012045832850
1997-01-01	13.77905614543370
1998-01-01	13.92557834114320
1999-01-01	14.07331775834880
2000-01-01	14.22595454245560
2001-01-01	14.39473355014570
2002-01-01	14.56948555830960
2003-01-01	14.74925684360870
2004-01-01	14.92828605483920
2005-01-01	15.10501624982100
2006-01-01	15.28884931800200
2007-01-01	15.47627496042200
2008-01-01	15.67502275757020
2009-01-01	15.90581374042830
2010-01-01	16.18402221494430
2011-01-01	16.49361975200800
2012-01-01	16.84534378326000
2013-01-01	17.24576481592550
2014-01-01	17.64523404576440