2006

6.3

1970

6.0

1989

5.9

1956

6.2

1990

6.1

2005

5.7

1947

7.0

2019

8.1

2000

6.3

1963

7.7

1986

5.8

1957

7.6

1999

7.2

2020

5.3

1978

7.4

2010

6.1

1959

7.3

1924

7.1

1990

7.9

1962

6.9