1966

3.7

2019

5.7

2001

6.3

1991

7.5

1985

7.4

1987

6.7

2003

5.8

2020

6.1

1945

8.1

1971

7.8

2005

7.6

1969

7.0

2005

6.6

1976

7.4

2013

6.5

2013

6.6

1964

7.5

1954

7.9

1970

7.1

1946

8.3