1978

7.7

1981

6.4

1984

6.7

1989

6.2

1986

7.1

2012

7.5

1992

5.2

1988

5.0

1992

7.0

2001

7.7

1993

5.9

1982

0.0

1972

6.7

1990

6.0

1979

6.8

1985

0.0

1982

5.0

1979

6.2

1984

6.6

1993

6.7

1996

7.0

1955

6.1

1990

7.0