1997

6.7

1994

8.3

1966

5.8

1993

6.3

1999

5.4

1991

6.7

1984

5.9

2003

7.1

2002

6.2

1997

6.8

1978

5.9

2005

6.7

1944

7.2

1975

6.6

1992

6.8

1999

6.0

1959

7.5

1998

7.5

1948

7.9

2007

6.1