Year	Percent of Total
1960-01-01	5.95060406908649
1961-01-01	5.84230976533904
1962-01-01	5.69793629588693
1963-01-01	5.54020695422624
1964-01-01	5.39626799241821
1965-01-01	5.27894977317349
1966-01-01	5.21904526554827
1967-01-01	5.17177086183153
1968-01-01	5.13424265217039
1969-01-01	5.09570328294385
1970-01-01	5.04877493537229
1971-01-01	5.03434166611785
1972-01-01	5.00567914976197
1973-01-01	4.97089403040373
1974-01-01	4.94218687697126
1975-01-01	4.92617512200614
1976-01-01	5.04480913686126
1977-01-01	5.17258513380101
1978-01-01	5.29186733285602
1979-01-01	5.37538721400341
1980-01-01	5.40756836179270
1981-01-01	5.37169688047047
1982-01-01	5.29940629326104
1983-01-01	5.22073766299600
1984-01-01	5.17313907364222
1985-01-01	5.17828141327954
1986-01-01	5.25264447498954
1987-01-01	5.37053551547748
1988-01-01	5.52772349391157
1989-01-01	5.71126482988711
1990-01-01	5.90840009826061
1991-01-01	6.00865697691739
1992-01-01	6.10447994976367
1993-01-01	6.19303832595505
1994-01-01	6.27534760508835
1995-01-01	6.35568607309173
1996-01-01	6.49266027561414
1997-01-01	6.63517284417672
1998-01-01	6.78745426630027
1999-01-01	6.94727885230083
2000-01-01	7.10831479344223
2001-01-01	7.11020908913142
2002-01-01	7.14764833002492
2003-01-01	7.21917057683122
2004-01-01	7.32514734290951
2005-01-01	7.46503757852060
2006-01-01	7.63702909534549
2007-01-01	7.82084079495584
2008-01-01	8.01798179393230
2009-01-01	8.21602158752865
2010-01-01	8.39624536071112
2011-01-01	8.32261056654566
2012-01-01	8.24804064108645
2013-01-01	8.18058483327275
2014-01-01	8.13994805541541
2015-01-01	8.14291566286062
2016-01-01	8.31940436861169
2017-01-01	8.51411714241699