1978

4.0

1968

5.9

1967

1.0

1980

6.3

1967

6.6

1977

5.4

1985

4.4

1968

6.9

1997

6.7

2009

6.0

1981

3.0

1995

3.5

2007

5.0

2006

5.5

1973

3.7

1978

4.4

1966

6.0

1988

4.1

1991

4.5

1987

4.3

1983

4.5

1994

2.6