Year	Percent of Total
1960-01-01	1.13053018740756
1961-01-01	1.19387487289515
1962-01-01	1.25153421423149
1963-01-01	1.30394551399536
1964-01-01	1.35179769844108
1965-01-01	1.39596119914132
1966-01-01	1.44402915964663
1967-01-01	1.48636893925410
1968-01-01	1.52417651618472
1969-01-01	1.55934276355421
1970-01-01	1.59293502973853
1971-01-01	1.63766279438073
1972-01-01	1.67868478661633
1973-01-01	1.71533857771696
1974-01-01	1.74701467428049
1975-01-01	1.77370014066087
1976-01-01	1.81350491235292
1977-01-01	1.84786850876201
1978-01-01	1.87771291788998
1979-01-01	1.90351268865238
1980-01-01	1.92517696059246
1981-01-01	1.96236019238138
1982-01-01	1.99650651552823
1983-01-01	2.02845559208159
1984-01-01	2.05993919358890
1985-01-01	2.09234423671621
1986-01-01	2.13277307712628
1987-01-01	2.17472247629666
1988-01-01	2.21740570243465
1989-01-01	2.25915964677542
1990-01-01	2.29929110214192
1991-01-01	2.32846076188303
1992-01-01	2.35538674886168
1993-01-01	2.37989282339723
1994-01-01	2.40166839984821
1995-01-01	2.42060714760155
1996-01-01	2.42650584055094
1997-01-01	2.43028013289901
1998-01-01	2.43239528372388
1999-01-01	2.43297552418840
2000-01-01	2.43239369987051
2001-01-01	2.42960060401074
2002-01-01	2.42591308767605
2003-01-01	2.42283439744581
2004-01-01	2.42235628336441
2005-01-01	2.42539367001338
2006-01-01	2.43435778383115
2007-01-01	2.44406012460307
2008-01-01	2.45364537931284
2009-01-01	2.46221792164912
2010-01-01	2.46950822674246
2011-01-01	2.48756551267780
2012-01-01	2.50433208806363
2013-01-01	2.51953558736359
2014-01-01	2.53224072693131
2015-01-01	2.54233748714942
2016-01-01	2.54942355451585
2017-01-01	2.55319232151009