2005

7.1

1998

6.9

1996

6.6

1947

6.5

2004

7.3

1999

6.5

1995

8.2

1989

7.4

1979

7.7

1977

7.7

1990

8.5

1928

7.0

1989

7.7

1998

5.6

1927

6.1

1975

7.8

1957

7.6

1961

7.7

1971

7.5

1999

7.2