1981

6.6

1948

7.5

1953

4.0

1983

2.0

1956

3.0

1992

7.0

2000

6.8

1990

7.8

1975

7.2

1981

6.5

2004

7.9

1970

7.5

1983

7.1

2010

8.2

2002

7.7

1976

6.6

1965

6.8

2010

5.3

2003

7.3

1977

7.2