1982

6.1

1965

6.4

1979

7.4

2005

4.7

1996

5.3

1981

6.3

1982

7.4

2002

5.0

1930

6.8

2011

3.6

2012

7.0

1989

5.0

1972

7.4

1922

6.2

2013

8.1

1984

6.7

1985

7.3

1953

6.9

1986

6.7

2002

7.7