1987

6.8

2002

6.4

1975

7.2

1990

7.4

1994

6.7

1972

5.4

1984

5.2

1977

6.1

1982

6.8

1978

6.3

2001

0.0

1979

6.8

1977

5.0

1986

0.0

1986

6.7

1981

6.7

1982

5.4

1983

7.5

1979

7.0

1977

6.3

1972

7.0

1985

7.7