Year	Percent of Total
1960-01-01	2.93981090663515
1961-01-01	2.79068862915929
1962-01-01	2.67138261379592
1963-01-01	2.56169288850722
1964-01-01	2.47458078647861
1965-01-01	2.39973924734834
1966-01-01	2.30198887831271
1967-01-01	2.21217915290573
1968-01-01	2.13302432377335
1969-01-01	2.05900430239705
1970-01-01	2.00613620176416
1971-01-01	1.99206189710611
1972-01-01	2.00330948258691
1973-01-01	2.03176299379223
1974-01-01	2.07541768594181
1975-01-01	2.12452786580137
1976-01-01	2.02719804873559
1977-01-01	1.91840739299398
1978-01-01	1.79912854710999
1979-01-01	1.68182238825598
1980-01-01	1.56764607306446
1981-01-01	1.48945773421884
1982-01-01	1.42539906847972
1983-01-01	1.37036761783514
1984-01-01	1.32228258482084
1985-01-01	1.28112191138862
1986-01-01	1.26378376204980
1987-01-01	1.25562045835001
1988-01-01	1.25418550047995
1989-01-01	1.25922878732111
1990-01-01	1.27401903682482
1991-01-01	1.31366527792308
1992-01-01	1.34707790045548
1993-01-01	1.37190319918017
1994-01-01	1.38691961072383
1995-01-01	1.38980046936927
1996-01-01	1.44226350937385
1997-01-01	1.50053871247718
1998-01-01	1.56277819159566
1999-01-01	1.62403173605270
2000-01-01	1.68167397474450
2001-01-01	1.59251466235253
2002-01-01	1.50373494367770
2003-01-01	1.41463811346731
2004-01-01	1.32607678673791
2005-01-01	1.24042767467217
2006-01-01	1.18004873404316
2007-01-01	1.14388218887674
2008-01-01	1.11455638712426
2009-01-01	1.08336790756736
2010-01-01	1.04412263805322
2011-01-01	1.03004322626321
2012-01-01	1.02447515320672
2013-01-01	1.02982795172393
2014-01-01	1.05099394841433
2015-01-01	1.08976727748385
2016-01-01	1.18818400158144
2017-01-01	1.30690573811643