1966

6.7

2011

3.6

2009

6.0

2005

4.7

1996

5.3

1965

7.3

1990

6.1

1980

7.3

1947

7.5

1961

7.2

1997

7.9

1979

7.4

1985

6.5

1988

6.4

1963

6.9

2020

5.4

1978

6.8

1988

7.2

1982

6.8

1975

7.7