1980

7.6

1977

5.9

1976

6.6

2010

8.1

1975

0.0

1974

5.4

1990

0.0

1989

0.0

1971

0.0

1996

0.0

1994

6.6

1983

6.0

1992

3.0

2004

6.4

1982

6.0

1978

8.0

1971

0.0

1992

7.1