Year	Percent of Total
1960-01-01	3.43519381831508
1961-01-01	3.48403829177361
1962-01-01	3.51559182063036
1963-01-01	3.53523361580969
1964-01-01	3.55015390457676
1965-01-01	3.56304062926377
1966-01-01	3.61806114204463
1967-01-01	3.66778217482337
1968-01-01	3.71063234505922
1969-01-01	3.74403808387106
1970-01-01	3.76778651620528
1971-01-01	3.80978934863424
1972-01-01	3.84386367354158
1973-01-01	3.86953047906680
1974-01-01	3.88613868378427
1975-01-01	3.89443269350242
1976-01-01	3.92532754498697
1977-01-01	3.94535453715419
1978-01-01	3.95918641400366
1979-01-01	3.97241813058290
1980-01-01	3.98790076462152
1981-01-01	4.03340389752170
1982-01-01	4.07569528460980
1983-01-01	4.11328742387201
1984-01-01	4.14444772760826
1985-01-01	4.16943919848469
1986-01-01	4.21489318585405
1987-01-01	4.25427752486532
1988-01-01	4.29001551795631
1989-01-01	4.32478812497217
1990-01-01	4.36037537306544
1991-01-01	4.43714269982371
1992-01-01	4.50620710636752
1993-01-01	4.56740615882889
1994-01-01	4.62001240253873
1995-01-01	4.66305032412386
1996-01-01	4.72347032001007
1997-01-01	4.77102601274128
1998-01-01	4.80457767565723
1999-01-01	4.82133342234044
2000-01-01	4.82069362923404
2001-01-01	4.84372971309896
2002-01-01	4.85069225387578
2003-01-01	4.84493466799107
2004-01-01	4.83056777793316
2005-01-01	4.81137836338610
2006-01-01	4.82706489725338
2007-01-01	4.84335201227799
2008-01-01	4.86102881033033
2009-01-01	4.87980387420335
2010-01-01	4.90155733634985
2011-01-01	4.96113081726000
2012-01-01	5.01713256960458
2013-01-01	5.08403054598844
2014-01-01	5.18126409771848
2015-01-01	5.31848065829131
2016-01-01	5.51167572839770
2017-01-01	5.73162843242055