1990

6.2

1991

6.8

1939

6.9

1992

6.2

1982

6.7

2006

4.7

1971

7.2

1944

8.1

1993

6.3

1966

7.3

1999

7.0

2006

6.0

2006

5.3

2008

6.6

1999

6.8

2003

6.3

1997

6.8

1993

5.0

2003

4.8

1997

6.9