1975

6.0

1998

6.7

1985

5.1

1995

4.2

1996

5.7

1975

4.9

1974

4.8

1972

7.0

1967

5.7

1997

5.7

1964

0.0

1959

6.3

1986

3.7

2004

5.9

1966

7.2

1984

1.0

1985

5.2

1999

0.0

1995

3.8

1962

5.8

2004

6.6

1975

5.1

1977

4.3

1998

6.4

1975

5.1

1997

5.0

1963

0.0

2000

7.1