Year	Percent of Total
1960-01-01	2.47470420040242
1961-01-01	2.49854078973275
1962-01-01	2.53374151530795
1963-01-01	2.56837866461324
1964-01-01	2.58816170146219
1965-01-01	2.59110449328509
1966-01-01	2.61115897288630
1967-01-01	2.62403778645487
1968-01-01	2.63107550100390
1969-01-01	2.64118698050182
1970-01-01	2.65627344395415
1971-01-01	2.68894931140438
1972-01-01	2.71933507932729
1973-01-01	2.74827988654715
1974-01-01	2.77742224497632
1975-01-01	2.80864197530864
1976-01-01	2.83427559158790
1977-01-01	2.85164695533183
1978-01-01	2.86170421395828
1979-01-01	2.86250938579929
1980-01-01	2.85834664967655
1981-01-01	2.90371656775434
1982-01-01	2.94294795430339
1983-01-01	2.97428093553782
1984-01-01	2.99597729667085
1985-01-01	3.00831969143139
1986-01-01	3.06357551245363
1987-01-01	3.11225233451030
1988-01-01	3.15379172716383
1989-01-01	3.18503532579348
1990-01-01	3.20689971397838
1991-01-01	3.23781874804749
1992-01-01	3.25607762563926
1993-01-01	3.26579443658652
1994-01-01	3.27446683915945
1995-01-01	3.28610748388266
1996-01-01	3.34108518860258
1997-01-01	3.39716907193083
1998-01-01	3.44904698896629
1999-01-01	3.48953959076535
2000-01-01	3.51874241029131
2001-01-01	3.59703382472245
2002-01-01	3.66939756167229
2003-01-01	3.73929940383039
2004-01-01	3.81344695566512
2005-01-01	3.89439770408717
2006-01-01	3.97588667895528
2007-01-01	4.05991531845072
2008-01-01	4.14752017593278
2009-01-01	4.23412686461206
2010-01-01	4.31675268609315
2011-01-01	4.41325176121962
2012-01-01	4.50908252341776
2013-01-01	4.60622164002954
2014-01-01	4.70424888196156
2015-01-01	4.80426959703202
2016-01-01	4.92214517762951
2017-01-01	5.03778630742693