1969

5.8

2008

6.0

1981

7.9

1984

7.3

2002

6.1

2004

6.9

2003

7.2

1998

7.2

1983

7.9

2003

5.6

1959

7.8

1939

7.6

1998

6.1

1995

5.8

1991

7.6

1984

6.2

1962

8.0

1960

7.5

1967

6.6

1977

8.2