1995

8.2

1997

7.8

1974

7.9

1988

7.5

1996

7.7

1998

6.2

2021

6.1

1981

7.4

1961

5.3

1967

7.7

2009

7.2

1971

6.7

2003

7.7

1946

6.0

1973

7.4

2001

6.3

2007

7.5

1996

7.4

1946

7.6

1941

7.7