1946

6.2

1931

6.2

1991

7.9

1941

7.4

2003

5.2

2007

4.0

1987

7.9

1971

7.5

1971

7.0

2006

8.2

1958

7.7

1990

6.4

1990

6.7

2004

7.1

2005

5.9

1976

6.6

1990

6.2

1972

7.4

2004

7.5

1993

7.5