1997

6.7

1999

5.4

2007

6.6

1948

7.9

1996

7.4

2001

7.8

1983

5.9

1999

7.0

2017

4.7

1946

7.6

1968

7.1

1995

7.9

1979

7.2

1991

8.3

2003

6.5

1946

7.7

2006

5.5

1955

7.3

1972

7.1

1956

7.5