2002

6.7

2006

8.0

1997

7.9

1984

7.5

1997

8.4

1991

6.4

1976

7.0

1961

7.2

1987

7.5

2007

6.1

1967

6.9

2005

6.6

1970

4.2

2016

6.0

2000

5.8

1977

4.7

1962

4.6

1929

0.0

1978

4.8

1928

8.0