1979

6.0

2011

6.2

1998

6.0

1968

7.5

2004

5.3

1965

6.9

1996

6.1

1977

5.3

1989

6.9

1998

5.4

1961

5.7

1966

6.7

1999

4.2

1935

1.0

1977

6.6

1953

4.8

1942

4.8

1939

6.4

1976

5.2

1934

6.4