Annual Percent of Total
1960-01-01 3.15049032127580
1961-01-01 3.19816491775723
1962-01-01 3.24434585822976
1963-01-01 3.28607093571223
1964-01-01 3.31968914995190
1965-01-01 3.34441583165685
1966-01-01 3.36851717272014
1967-01-01 3.38713383070168
1968-01-01 3.40362293547856
1969-01-01 3.42174588297516
1970-01-01 3.44400026129065
1971-01-01 3.48313740898156
1972-01-01 3.52053857701418
1973-01-01 3.55685985331982
1974-01-01 3.59259040744007
1975-01-01 3.62772680767312
1976-01-01 3.66629707351800
1977-01-01 3.69983779351478
1978-01-01 3.72796149747578
1979-01-01 3.74941485581028
1980-01-01 3.76438015588360
1981-01-01 3.78282403608623
1982-01-01 3.79483890823571
1983-01-01 3.80352919624835
1984-01-01 3.81288171678393
1985-01-01 3.82610059896910
1986-01-01 3.86476008311484
1987-01-01 3.90347196637489
1988-01-01 3.94441053971492
1989-01-01 3.99024879212723
1990-01-01 4.04253249928215
1991-01-01 4.13946683376084
1992-01-01 4.23702946420777
1993-01-01 4.33164947824158
1994-01-01 4.41784888766530
1995-01-01 4.49342590096705
1996-01-01 4.61181282728029
1997-01-01 4.71965935107503
1998-01-01 4.82493983686023
1999-01-01 4.93816877861638
2000-01-01 5.06524458003977
2001-01-01 5.22085627019015
2002-01-01 5.39116067513156
2003-01-01 5.56854139195829
2004-01-01 5.74190729685532
2005-01-01 5.90669370727955
2006-01-01 6.06976117526081
2007-01-01 6.22471933063450
2008-01-01 6.38033420719512
2009-01-01 6.54805088966527
2010-01-01 6.73438021327528
2011-01-01 6.95156084135843
2012-01-01 7.18018319644953
2013-01-01 7.42277582311806
2014-01-01 7.68207792003269
2015-01-01 7.96042299198064
2016-01-01 8.24733191136082
2017-01-01 8.55237960340999