2016

4.7

1997

6.2

1986

6.9

1978

6.6

1932

7.1

1923

5.7

1935

7.3

1940

7.4

1988

7.3

1987

6.6

1967

6.6

1966

6.0

1967

7.1

1993

6.5

1968

7.0

1958

6.2

1995

6.3

2002

6.1

1982

6.5

1966

6.5