1974

6.7

2004

6.9

2006

6.2

1998

7.3

1987

7.8

1932

6.9

1986

7.6

1953

7.3

1931

8.1

2005

6.2

2006

6.3

2003

5.8

2005

5.8

2003

6.6

1956

4.6

1966

7.3

1996

6.6

1998

6.7

2005

6.3

2005

4.5