Year	Percent of Total
1960-01-01	42.6544860061493
1961-01-01	42.9454279328892
1962-01-01	43.1074111273828
1963-01-01	43.1909048858538
1964-01-01	43.2583451207072
1965-01-01	43.3400356805924
1966-01-01	43.5601893779077
1967-01-01	43.7825654675988
1968-01-01	43.9801006407056
1969-01-01	44.1076473543822
1970-01-01	44.1509731228936
1971-01-01	44.3905953002071
1972-01-01	44.5071970630515
1973-01-01	44.5420624417465
1974-01-01	44.5461889281855
1975-01-01	44.5432831952954
1976-01-01	44.6583672764904
1977-01-01	44.7428750815564
1978-01-01	44.8021340171120
1979-01-01	44.8300814216789
1980-01-01	44.8230169347897
1981-01-01	44.9601442912469
1982-01-01	45.0484101722725
1983-01-01	45.0911877609031
1984-01-01	45.0923910896686
1985-01-01	45.0599719077784
1986-01-01	45.1777811713682
1987-01-01	45.2157208867980
1988-01-01	45.2019861013811
1989-01-01	45.1653091265515
1990-01-01	45.1182270233490
1991-01-01	45.1366510126678
1992-01-01	45.1228886525098
1993-01-01	45.0778873334363
1994-01-01	44.9941464582767
1995-01-01	44.8680870476804
1996-01-01	44.9034038605467
1997-01-01	44.8850187834317
1998-01-01	44.8259941060673
1999-01-01	44.7405804528153
2000-01-01	44.6368647487702
2001-01-01	44.6045088892734
2002-01-01	44.5324609062421
2003-01-01	44.4332048244062
2004-01-01	44.3171317350458
2005-01-01	44.1875225478373
2006-01-01	44.1015176147451
2007-01-01	43.9938532428870
2008-01-01	43.8642590682842
2009-01-01	43.7089609528980
2010-01-01	43.5266648545933
2011-01-01	43.3983792097975
2012-01-01	43.2341718320337
2013-01-01	43.0392364697387
2014-01-01	42.8216576067890
2015-01-01	42.5861245880165
2016-01-01	42.3486661361146
2017-01-01	42.0892594616863