Year	Percent
1960-01-01	1.783264746228050
1961-01-01	1.752021563341500
1962-01-01	3.576158940397420
1963-01-01	2.941176470588950
1964-01-01	13.354037267080100
1965-01-01	9.479452054794850
1966-01-01	10.810810810810700
1967-01-01	13.053297199638500
1968-01-01	2.996404314822260
1969-01-01	0.574712643678068
1970-01-01	5.095238095238390
1971-01-01	3.081105573175930
1972-01-01	6.461538461538340
1973-01-01	16.928158546655900
1974-01-01	28.601694915254200
1975-01-01	5.738605161999040
1976-01-01	-7.634380680342720
1977-01-01	8.321619342141950
1978-01-01	2.517518816506890
1979-01-01	6.253164556961840
1980-01-01	11.365260900642900
1981-01-01	13.115104835259400
1982-01-01	7.887270663892020
1983-01-01	11.868863955119800
1984-01-01	8.321579689703930
1985-01-01	5.555555555555010
1986-01-01	8.730811403508890
1987-01-01	8.798689020547400
1988-01-01	9.384775808133500
1989-01-01	3.262560110157660
1990-01-01	8.971233544612530
1991-01-01	13.870246085010800
1992-01-01	11.787819253438400
1993-01-01	6.362038664323510
1994-01-01	10.211500330469200
1995-01-01	10.224887556221700
1996-01-01	8.977149075081570
1997-01-01	7.164253619570720
1998-01-01	13.230840903797000
1999-01-01	4.669821024480540
2000-01-01	4.009433962264160
2001-01-01	3.684807256235860
2002-01-01	4.392199744851390
2003-01-01	3.805865921787680
2004-01-01	3.767238479650360
2005-01-01	4.246353322528320
2006-01-01	6.145522388059660
2007-01-01	6.369996745850900
2008-01-01	8.351816443594710
2009-01-01	10.877391120208900
2010-01-01	11.992296918767500
2011-01-01	8.857845296801000
2012-01-01	9.312445604873550
2013-01-01	10.907643312102200
2014-01-01	6.657577823221980
2015-01-01	4.906973441272540
2016-01-01	4.948216340621400
2017-01-01	3.328173374613020