1986

4.6

1984

6.1

1977

6.8

1989

6.9

1969

6.0

2003

9.1

1981

5.6

1982

7.5

1986

8.3

1988

6.4

1984

7.3

1980

6.5

1993

4.8

1968

7.8

1975

6.6

1989

7.8

1993

5.7

1989

8.3

1990

7.9

1979

0.0

1995

6.3

1996

6.9

1986

5.5

2000

6.7