1985

7.1

2004

5.8

2004

6.5

1988

7.2

2006

6.8

1996

7.9

1996

6.9

1991

7.1

1966

6.2

2006

5.2

2003

5.1

1922

7.7

1996

7.5

2002

4.4

1974

6.6

1975

6.1

1931

6.9

1976

4.9

2001

7.1

2021

6.5