1961

4.0

1925

7.6

2001

7.0

1967

7.3

1984

8.1

1979

7.4

1994

6.8

1968

7.1

1939

7.9

1956

6.0

2008

7.4

2007

6.5

2002

6.1

1988

5.3

1997

4.9

1969

8.0

1962

6.5

1954

7.5

2007

6.6

2004

5.6