1972

7.7

2006

6.0

2006

7.1

1999

7.8

2001

5.9

1999

6.8

1978

7.2

2000

5.7

1997

6.9

2000

6.9

2005

6.5

1946

7.6

1995

7.9

1975

7.5

1973

6.0

1953

7.3

1998

6.5

2002

5.3

1967

7.3

1999

5.8