1984

6.9

1998

7.7

1989

8.3

1955

7.5

1983

7.2

1979

7.0

1986

7.9

1994

6.8

1994

7.1

2014

7.9

2014

5.3

1987

7.3

1998

7.3

2000

6.3

1959

8.0

2003

6.0

2000

7.6

1997

6.6

2000

7.6

1977

5.6