Year	Percent of Total
1960-01-01	5.02124940421716
1961-01-01	5.02844492643844
1962-01-01	5.02650008682190
1963-01-01	5.01228401545644
1964-01-01	4.98853742288534
1965-01-01	4.95936089183738
1966-01-01	5.02107352633400
1967-01-01	5.08239662618695
1968-01-01	5.14404581272951
1969-01-01	5.20137573386434
1970-01-01	5.25457957737428
1971-01-01	5.28218812937469
1972-01-01	5.29440922900551
1973-01-01	5.29271285310526
1974-01-01	5.28080944892109
1975-01-01	5.26151006243057
1976-01-01	5.26604403664032
1977-01-01	5.26003957549528
1978-01-01	5.24086594544890
1979-01-01	5.19905402456964
1980-01-01	5.13393486087846
1981-01-01	5.10746668912915
1982-01-01	5.06319707421570
1983-01-01	5.00757829143721
1984-01-01	4.95048509009628
1985-01-01	4.90304571614253
1986-01-01	4.87571538174613
1987-01-01	4.85409119921329
1988-01-01	4.83800985735102
1989-01-01	4.82685508546182
1990-01-01	4.82053624722421
1991-01-01	4.86431005846758
1992-01-01	4.89814644431409
1993-01-01	4.92687193959513
1994-01-01	4.95676067055337
1995-01-01	4.98512351607396
1996-01-01	5.02894598022570
1997-01-01	5.06736539836596
1998-01-01	5.09920819666449
1999-01-01	5.13293213559500
2000-01-01	5.16286919269438
2001-01-01	5.19541035352804
2002-01-01	5.22214543547364
2003-01-01	5.23953295114016
2004-01-01	5.24152592520034
2005-01-01	5.22526819251857
2006-01-01	5.21107630584348
2007-01-01	5.18229407416446
2008-01-01	5.14840076200447
2009-01-01	5.11868339571883
2010-01-01	5.09960844890328
2011-01-01	5.10046610856536
2012-01-01	5.11081811966690
2013-01-01	5.13163290053209
2014-01-01	5.16343413577937
2015-01-01	5.20727327781683
2016-01-01	5.27414144479921
2017-01-01	5.34709286523022