1968

7.6

1979

7.1

1990

6.1

1949

7.5

1925

7.3

1976

7.6

1982

7.6

2006

7.3

1982

6.5

1976

6.5

2009

8.8

1958

8.0

1974

7.0

1960

7.7

2020

6.9

1960

6.2

1960

8.1

1993

7.4

2015

5.6

1999

6.6