Annual Percent of Total
1960-01-01 55.7044572007429
1961-01-01 56.1968845413352
1962-01-01 56.7619927838899
1963-01-01 57.3618289936322
1964-01-01 58.0002072017405
1965-01-01 58.6489753235642
1966-01-01 59.3782876609388
1967-01-01 60.1436931456052
1968-01-01 60.8394759712879
1969-01-01 61.4320835894284
1970-01-01 61.9217634275070
1971-01-01 62.2722400857449
1972-01-01 62.8303736957421
1973-01-01 63.4999753938738
1974-01-01 64.1694425649300
1975-01-01 64.7454884954353
1976-01-01 64.8053337628569
1977-01-01 64.8854710786382
1978-01-01 64.9227197243002
1979-01-01 64.8848343748326
1980-01-01 64.7565635124567
1981-01-01 66.3308401573280
1982-01-01 67.4973683831057
1983-01-01 68.3623121439581
1984-01-01 69.0940241027368
1985-01-01 69.8017413987782
1986-01-01 69.5339907320849
1987-01-01 69.6029985248886
1988-01-01 69.8497501092849
1989-01-01 70.1316387728149
1990-01-01 70.4127443881246
1991-01-01 70.7393572394157
1992-01-01 70.9279399092261
1993-01-01 71.0209623459325
1994-01-01 71.1316420000197
1995-01-01 71.3133575483733
1996-01-01 71.5271183065801
1997-01-01 71.8496543261605
1998-01-01 72.1862907181658
1999-01-01 72.4432651326638
2000-01-01 72.5887142116647
2001-01-01 73.8888546668266
2002-01-01 74.9609313894796
2003-01-01 75.8047651273770
2004-01-01 76.4803552720876
2005-01-01 77.0476942590907
2006-01-01 80.2244101735779
2007-01-01 82.5727766462430
2008-01-01 84.1681889700304
2009-01-01 85.1968216849596
2010-01-01 85.8716979944664
2011-01-01 85.6769843457199
2012-01-01 85.6155383471877
2013-01-01 85.4797191523738
2014-01-01 85.2672169486515
2015-01-01 85.0838935031849
2016-01-01 84.9299790956820
2017-01-01 84.8158029047318