1981

10.0

1982

6.7

1963

4.2

1962

7.0

1963

7.1

1964

7.4

1979

6.9

1959

7.9

1967

6.6

1969

6.6

2001

7.9

2005

7.8

1974

6.5

1997

7.4

1995

7.7

1977

6.8

1980

8.2

1979

7.7

1979

6.2

2000

7.1