1973

4.8

1975

6.4

1944

7.4

2008

5.9

1951

5.8

1968

6.3

1961

7.7

1939

7.6

1993

6.4

1983

5.8

1958

8.0

1998

7.7

2003

7.1

2006

6.9

1993

7.4

2006

6.3

2006

6.0

2006

6.0

2007

5.9

2006

7.1