1961

7.7

1999

7.2

2002

4.5

1999

6.8

1997

6.8

1928

6.9

1989

7.8

1927

6.1

1975

7.8

1957

7.6

1979

7.7

1993

7.4

1990

8.5

2007

6.7

1997

7.4

1992

7.5

2003

5.8

2002

7.3

2002

6.3

2003

6.4