Year	Percent of Total
1960-01-01	2.42672917132623
1961-01-01	2.43879264956872
1962-01-01	2.44556791582348
1963-01-01	2.44844745018753
1964-01-01	2.44920291536846
1965-01-01	2.44933177009254
1966-01-01	2.45567172787330
1967-01-01	2.45868386696627
1968-01-01	2.45862930128774
1969-01-01	2.45562275518296
1970-01-01	2.44994892601569
1971-01-01	2.45440233838467
1972-01-01	2.45693038217929
1973-01-01	2.45863639704403
1974-01-01	2.46052241555380
1975-01-01	2.46340795771092
1976-01-01	2.46702938126952
1977-01-01	2.46929572615049
1978-01-01	2.47192362054197
1979-01-01	2.47679719858603
1980-01-01	2.48530355964033
1981-01-01	2.49321997766174
1982-01-01	2.50336310363246
1983-01-01	2.51582495037757
1984-01-01	2.53023212265757
1985-01-01	2.54722937253083
1986-01-01	2.56857949051563
1987-01-01	2.58820356470455
1988-01-01	2.60792383926836
1989-01-01	2.62966137277527
1990-01-01	2.65458534626632
1991-01-01	2.67331066982806
1992-01-01	2.69052259211964
1993-01-01	2.70753346006759
1994-01-01	2.72551549457025
1995-01-01	2.74542288536685
1996-01-01	2.75383889924069
1997-01-01	2.75566092057833
1998-01-01	2.75266183144479
1999-01-01	2.74694846386552
2000-01-01	2.74012122689630
2001-01-01	2.76077349544769
2002-01-01	2.77319856364981
2003-01-01	2.77743164272679
2004-01-01	2.77301514223621
2005-01-01	2.76009836879332
2006-01-01	2.79754976554104
2007-01-01	2.82581822924005
2008-01-01	2.84483741038690
2009-01-01	2.85400057362510
2010-01-01	2.85346088448837
2011-01-01	2.87480765421486
2012-01-01	2.88508078701491
2013-01-01	2.88787667224248
2014-01-01	2.88710618760083
2015-01-01	2.88510205261516
2016-01-01	2.91111731095975
2017-01-01	2.93279412218689