1970

7.0

1972

5.4

1965

6.7

1976

6.5

1985

8.1

1978

10.0

1978

6.2

1986

0.0

2001

6.3

1990

6.9

1966

6.1

2001

6.7

1985

7.5

1989

6.5

1992

7.4

1980

4.7

1993

0.0

1994

8.2

2007

6.2

1985

6.8

1984

8.1

1991

6.5

1997

7.5

1975

5.5

1997

2.0

1966

0.0

1984

7.0