1989

6.9

1971

6.5

1977

6.8

1989

6.7

1997

6.4

1989

6.5

1990

6.9

1994

7.8

1996

6.8

1985

6.7

1993

6.2

1985

6.5

1974

7.6

1974

4.6

1984

7.4

1981

7.6

1987

5.0

1986

7.2

1999

0.0

1987

4.4

1976

7.2

1984

7.5

1996

9.0

1969

6.7

1965

5.4

1977

7.2

1977

6.2

1973

6.7

1970

7.8

1996

7.4

2000

6.5

1987

6.3