2004

6.3

1953

7.3

2006

7.7

1996

7.3

1993

7.2

1953

7.3

1999

7.1

2007

6.3

1997

6.6

1999

6.3

2002

6.0

1993

6.7

1999

7.6

2001

6.9

2000

6.2

2006

6.6

1976

7.1

1939

6.0

2000

5.3

1999

6.9