1947

7.3

1968

7.6

1992

6.4

1987

5.7

1993

6.3

2010

6.8

1950

7.1

1959

7.0

1923

7.5

1976

6.7

2020

6.9

2005

7.6

1968

7.1

1983

5.5

1995

6.2

1974

7.7

2011

5.4

1990

6.6

1989

6.3

1959

7.7