1934

4.1

1962

6.0

1990

7.7

1997

6.8

1966

7.1

1999

7.1

2006

5.8

2001

7.3

2002

6.2

1978

5.9

1960

7.2

1975

6.9

1944

7.2

1947

6.0

1946

6.0

1998

7.2

2000

6.5

2004

7.0

1956

6.2

1958

6.6