1966

6.1

1979

9.1

1982

7.6

2006

7.3

2009

8.8

1976

6.5

1967

5.5

2003

8.7

1991

8.3

1925

7.3

1956

6.6

2007

8.2

2010

7.3

1955

7.7

1961

7.4

1982

6.5

1949

7.0

1995

7.1

2018

6.8

1968

7.6