1995

6.7

1999

7.3

1990

5.3

1997

6.0

1992

6.4

1979

0.0

1981

7.3

1978

0.0

1981

0.0

1984

3.0

1970

6.3

1994

6.6

1991

7.3

2004

0.0

1979

5.6

2001

7.0

1994

7.0