1948

7.3

1968

6.6

1986

6.8

1965

7.9

1941

7.3

1998

6.1

1971

7.1

1988

5.8

1990

6.1

1987

7.1

1923

6.8

2005

6.2

1994

6.5

2011

7.0

1979

6.7

1985

6.2

2012

4.9

1988

6.0

2016

4.9

1998

6.0