1996

6.0

2002

6.1

2008

6.6

1980

7.2

1998

7.1

1963

5.7

1982

5.2

1997

6.8

1997

4.5

2004

6.4

1992

6.5

1999

4.8

1965

7.2

2010

4.6

1941

6.0

1984

6.8

1993

6.5

1995

6.2

2009

5.6

1937

6.0