1971

7.8

1990

7.4

1994

7.2

1996

5.9

1980

6.2

1971

8.1

2000

7.0

1978

0.0

2011

5.0

1982

7.3

1985

7.5

1992

5.8

1988

6.5

2003

5.9

1989

8.0

1996

7.8

1991

7.0

1978

5.0

1991

0.0

1980

4.4

1974

7.4

1997

6.1