Year	Percent
1960-01-01	5.118909512760980
1961-01-01	1.958890881500770
1962-01-01	-3.846153846153290
1963-01-01	1.916666666666570
1964-01-01	5.396565821750210
1965-01-01	-3.878975950349450
1966-01-01	3.793381759483790
1967-01-01	6.454121306375260
1968-01-01	2.848794740686600
1969-01-01	-1.988636363635990
1970-01-01	4.637681159419820
1971-01-01	5.609418282548500
1972-01-01	2.098360655738340
1973-01-01	20.359666024405900
1974-01-01	15.528281750266800
1975-01-01	11.464968152866300
1976-01-01	11.428571428571500
1977-01-01	11.965811965811600
1978-01-01	4.809160305343720
1979-01-01	4.552075746540380
1980-01-01	19.296412399860800
1981-01-01	18.394160583941700
1982-01-01	14.303329223181100
1983-01-01	6.127292340884620
1984-01-01	9.229518194754980
1985-01-01	17.252931323283100
1986-01-01	36.063492063491600
1987-01-01	59.484367708819800
1988-01-01	34.562211981567000
1989-01-01	11.399217221134900
1990-01-01	19.396867222954300
1991-01-01	9.000000000000040
1992-01-01	11.009174311926500
1993-01-01	13.223140495867900
1994-01-01	15.328467153284600
1995-01-01	7.979957805906840
1996-01-01	8.249890099155110
1997-01-01	1.886111361790840
1998-01-01	-0.797165633303876
1999-01-01	-3.703703703703670
2000-01-01	-3.846153846153790
2001-01-01	2.999999999999950
2002-01-01	-0.130505282417403
2003-01-01	5.796829449058430
2004-01-01	4.433141367198380
2005-01-01	7.240349393485340
2006-01-01	10.024110537757100
2007-01-01	3.907709504436070
2008-01-01	15.745325221970900
2009-01-01	2.920897118053650
2010-01-01	4.397413831500690
2011-01-01	4.753163888856320
2012-01-01	36.702295336413900