2006

7.4

2012

6.0

1969

6.6

1942

5.8

1980

6.8

1975

6.8

1967

6.1

1990

6.1

1982

6.7

1998

6.2

2011

7.6

2000

4.8

1955

7.2

1956

7.5

1958

6.6

1977

6.7

1977

5.7

1996

6.9

2001

7.0