Year	Percent of Total
1960-01-01	1.99393215586496
1961-01-01	1.87697454004832
1962-01-01	1.79724265140587
1963-01-01	1.74076248186980
1964-01-01	1.70000117582043
1965-01-01	1.66570232750647
1966-01-01	1.72904568110110
1967-01-01	1.77269014018829
1968-01-01	1.80170956863869
1969-01-01	1.82628713308225
1970-01-01	1.85854490088609
1971-01-01	1.85385362395181
1972-01-01	1.82880023964316
1973-01-01	1.78510104345529
1974-01-01	1.74185403914041
1975-01-01	1.72858899057506
1976-01-01	1.73006282540816
1977-01-01	1.73642411236326
1978-01-01	1.72670110239402
1979-01-01	1.68841171270225
1980-01-01	1.63045299996065
1981-01-01	1.59848536823861
1982-01-01	1.54693200751134
1983-01-01	1.47883323063219
1984-01-01	1.41046832621406
1985-01-01	1.35980917702994
1986-01-01	1.33679718752468
1987-01-01	1.33770157658237
1988-01-01	1.34612790814587
1989-01-01	1.34420191021931
1990-01-01	1.32871978910419
1991-01-01	1.40701226775971
1992-01-01	1.44985828511689
1993-01-01	1.45379900367839
1994-01-01	1.42433705223531
1995-01-01	1.36038160967211
1996-01-01	1.35812077904568
1997-01-01	1.38726787048902
1998-01-01	1.43828555838665
1999-01-01	1.50168670857294
2000-01-01	1.57523548805042
2001-01-01	1.67036843015993
2002-01-01	1.78409419017246
2003-01-01	1.91289731586756
2004-01-01	2.04231185734751
2005-01-01	2.15828444147318
2006-01-01	2.14701138875124
2007-01-01	2.11503509213433
2008-01-01	2.07126537321761
2009-01-01	2.02828085318625
2010-01-01	1.99344047513028
2011-01-01	1.98185488104076
2012-01-01	1.98129555218645
2013-01-01	1.99125440996447
2014-01-01	2.01586273447104
2015-01-01	2.06410701373090
2016-01-01	2.19479719606059
2017-01-01	2.34520351367137