1992

6.0

1969

6.9

1972

7.1

1980

6.4

1977

6.7

1973

7.3

1966

7.5

1965

7.7

1974

6.5

1981

6.8

2002

6.5

1983

6.4

1953

6.8

1979

6.2

1986

6.6

1991

7.1

1985

6.8

1967

7.1

2011

7.1

1985

7.0