1995

6.2

1971

8.1

1987

6.0

1982

6.9

1991

7.5

1982

7.5

1979

6.7

1993

6.5

2000

3.9

1985

7.7

1984

7.5

1996

7.8

1989

6.2

2005

5.8

1985

0.0

1989

5.7

1990

0.0