Year	Percent of Total
1960-01-01	2.54082523289865
1961-01-01	2.54146634615385
1962-01-01	2.53678384277856
1963-01-01	2.52815665855453
1964-01-01	2.51723299164535
1965-01-01	2.50519967226308
1966-01-01	2.52112702565357
1967-01-01	2.53173458661243
1968-01-01	2.53932369187631
1969-01-01	2.54481782902913
1970-01-01	2.54873032605867
1971-01-01	2.57087924887247
1972-01-01	2.59093551036288
1973-01-01	2.60908421927321
1974-01-01	2.62558963481729
1975-01-01	2.64121232317844
1976-01-01	2.66854589992563
1977-01-01	2.69587188942386
1978-01-01	2.72234306227136
1979-01-01	2.74748959176272
1980-01-01	2.77096904221963
1981-01-01	2.80515360629485
1982-01-01	2.83595665873484
1983-01-01	2.86663119742150
1984-01-01	2.90137218923352
1985-01-01	2.94220335925972
1986-01-01	2.98992577398979
1987-01-01	3.04189373884705
1988-01-01	3.09631912074576
1989-01-01	3.15076819887233
1990-01-01	3.20378616332474
1991-01-01	3.26928264981055
1992-01-01	3.33135008451318
1993-01-01	3.39045041544488
1994-01-01	3.44756648546417
1995-01-01	3.50338274690670
1996-01-01	3.57345027281648
1997-01-01	3.64036150619224
1998-01-01	3.70586981423214
1999-01-01	3.77112771382277
2000-01-01	3.83723548757499
2001-01-01	3.92416801450767
2002-01-01	4.01000902211908
2003-01-01	4.09620218287810
2004-01-01	4.18439600105693
2005-01-01	4.27544109598820
2006-01-01	4.37291326886243
2007-01-01	4.47512235368173
2008-01-01	4.57500626507506
2009-01-01	4.66258225197875
2010-01-01	4.73454365085244
2011-01-01	4.78926688499299
2012-01-01	4.83184927008318
2013-01-01	4.88037920214230
2014-01-01	4.96009559033701
2015-01-01	5.08532094932042
2016-01-01	5.24754110942437
2017-01-01	5.44497932556086