Year	Percent
1960-01-01	29872.501841045700
1961-01-01	30567.021167218800
1962-01-01	34905.724251900200
1963-01-01	42896.781910691900
1964-01-01	46990.360527312296
1965-01-01	48845.135668974600
1966-01-01	41646.647123580304
1967-01-01	38100.513152296500
1968-01-01	45462.418009731400
1969-01-01	47799.271271913900
1970-01-01	48461.107335678800
1971-01-01	54540.194143594000
1972-01-01	52268.707406227900
1974-01-01	51851.995810524000
1975-01-01	44302.162194242200
1976-01-01	47047.556236526510
1977-01-01	41115.544109448005
1978-01-01	38321.125173551500
1979-01-01	37863.559499837400
1980-01-01	39747.259328730900
1981-01-01	39216.319730910596
1982-01-01	34801.056104038100
1983-01-01	31057.842060433100
1984-01-01	28719.109510662200
1985-01-01	30625.279082461300
1986-01-01	29699.852507374602
1987-01-01	32486.590876605198
1988-01-01	35262.625477397100
1989-01-01	32798.961157071100
1990-01-01	32273.169173080000
1991-01-01	32035.071606436700
1992-01-01	29843.413737502400
1993-01-01	28016.174244419000
1994-01-01	30966.002093066203
1995-01-01	26925.125237079003
1996-01-01	26447.295940671900
1997-01-01	26216.225275446297
1998-01-01	32225.533318120200
1999-01-01	30351.801884261098
2000-01-01	32583.333333333300
2001-01-01	31650.000000000000
2002-01-01	31391.666666666700
2003-01-01	34491.666666666700
2004-01-01	41700.000000000000
2005-01-01	45966.666666666700
2006-01-01	50191.666666666700
2007-01-01	47625.000000000000
2008-01-01	39691.666666666700
2009-01-01	31683.333333333303
2010-01-01	39733.333333333300
2011-01-01	43166.666666666700
2012-01-01	40116.666666666700
2013-01-01	35200.000000000000
2014-01-01	31658.333333333300
2015-01-01	33691.666666666700
2016-01-01	38616.666666666700
2017-01-01	41350.000000000000