Year	Percent of Total
1960-01-01	1.94041259986390
1961-01-01	2.00199044180335
1962-01-01	2.06099162536544
1963-01-01	2.11630997760722
1964-01-01	2.16882646586708
1965-01-01	2.21782868636301
1966-01-01	2.27785595597143
1967-01-01	2.33235071073834
1968-01-01	2.38237403133862
1969-01-01	2.42886641548395
1970-01-01	2.47295692953657
1971-01-01	2.52452758095412
1972-01-01	2.57130682028111
1973-01-01	2.61357999288605
1974-01-01	2.65287149730010
1975-01-01	2.68874662636620
1976-01-01	2.73186683172914
1977-01-01	2.76993056877897
1978-01-01	2.80389446663730
1979-01-01	2.83402086269785
1980-01-01	2.86059768526516
1981-01-01	2.89745385822623
1982-01-01	2.92900726344574
1983-01-01	2.95653920846447
1984-01-01	2.98074397435629
1985-01-01	3.00281026157919
1986-01-01	3.03254917431979
1987-01-01	3.05706427333726
1988-01-01	3.07732389253885
1989-01-01	3.09443682535184
1990-01-01	3.10919443979233
1991-01-01	3.13082377630561
1992-01-01	3.14796784414262
1993-01-01	3.16139124125883
1994-01-01	3.17095183830569
1995-01-01	3.17690663171578
1996-01-01	3.18048426422831
1997-01-01	3.17931961427384
1998-01-01	3.17473206541758
1999-01-01	3.16817197789260
2000-01-01	3.16059997955236
2001-01-01	3.16075118723459
2002-01-01	3.15731992031262
2003-01-01	3.15141402927243
2004-01-01	3.14362682285496
2005-01-01	3.13471022640159
2006-01-01	3.13290503509692
2007-01-01	3.12817625688079
2008-01-01	3.12178195361406
2009-01-01	3.11420510808011
2010-01-01	3.10657055477660
2011-01-01	3.10363582370903
2012-01-01	3.09897110859140
2013-01-01	3.09522904487136
2014-01-01	3.09496742061852
2015-01-01	3.10020153784687
2016-01-01	3.11812226779800
2017-01-01	3.13824039904221