Year	Percent of Total
1960-01-01	3.426387719411880
1961-01-01	3.170818575753380
1962-01-01	2.941176470588230
1963-01-01	2.720481659047830
1964-01-01	2.505612543222000
1965-01-01	2.279166278714040
1966-01-01	2.075011995189460
1967-01-01	1.883335388735220
1968-01-01	1.710208849634810
1969-01-01	1.558237660680990
1970-01-01	1.431428583560860
1971-01-01	1.205847751857910
1972-01-01	1.148575549945910
1973-01-01	1.208034765619100
1974-01-01	1.334213049787430
1975-01-01	1.488299261803570
1976-01-01	1.448813883139630
1977-01-01	1.439480722935050
1978-01-01	1.447794222903290
1979-01-01	1.452985168690390
1980-01-01	1.437953767517540
1981-01-01	1.400927825854220
1982-01-01	1.338663102278600
1983-01-01	1.275198314526040
1984-01-01	1.229978808899350
1985-01-01	1.208653594545710
1986-01-01	1.181414708962940
1987-01-01	1.172921693733270
1988-01-01	1.176979301856630
1989-01-01	1.184538191832430
1990-01-01	1.188867278007330
1991-01-01	1.166685109739670
1992-01-01	1.138337776682980
1993-01-01	1.107046509362800
1994-01-01	1.077431650295490
1995-01-01	1.050465121977120
1996-01-01	1.050555810534340
1997-01-01	1.065773830467290
1998-01-01	1.086413837207050
1999-01-01	1.098936403046420
2000-01-01	1.096983288033790
2001-01-01	1.050350688147320
2002-01-01	1.005037590897890
2003-01-01	0.966185382310528
2004-01-01	0.937589210776796
2005-01-01	0.919214544971768
2006-01-01	0.844214609906998
2007-01-01	0.795176492914456
2008-01-01	0.765896008254962
2009-01-01	0.752074671882853
2010-01-01	0.750469973221078
2011-01-01	0.810737419248830
2012-01-01	0.875528470292467
2013-01-01	0.937802948903447
2014-01-01	0.988196607887648
2015-01-01	1.021858356868720
2016-01-01	1.084176986048610
2017-01-01	1.143790867055770