1967

7.7

2006

6.8

1994

7.4

2003

6.4

2007

5.0

1993

8.1

1987

6.5

2007

7.0

2017

10.0

1979

8.0

1999

6.0

1966

7.5

1998

6.2

1991

8.3

2009

5.9

1982

4.5

1973

5.2

1933

6.8

1981

6.4

2022

7.0