1991

6.7

1932

7.0

2006

6.1

2003

5.8

2003

7.4

2007

4.8

1934

3.7

1997

6.8

1996

5.7

1931

7.2

1931

7.5

1933

6.9

1992

6.6

2008

5.4

1932

6.0

1933

6.1

1961

7.7

1997

6.8

1977

7.0

1930

7.3