1997

7.7

1963

6.8

1941

5.0

2005

6.7

1970

6.9

2006

5.6

1968

10.0

1992

6.1

2007

6.9

2004

6.5

1994

6.8

1984

5.8

2000

5.9

1991

7.2

1982

5.9

2003

7.1

2008

6.3

2005

5.8

2004

5.5

1987

7.3