1959

8.0

1973

6.5

1999

6.3

1987

6.5

1997

6.4

1962

7.0

1963

7.1

1965

6.7

1977

6.8

1996

7.0

2000

6.1

2006

6.7

1926

7.9

1962

6.5

1964

7.4

2003

5.5

1985

6.2

2000

5.7

1999

6.4

1966

3.4