1967

6.1

2006

6.5

1970

6.3

2017

5.6

2000

5.1

2020

6.3

1991

5.0

2021

5.7

1996

6.9

1969

6.6

1977

6.7

1942

5.8

1972

7.1

2004

5.7

2021

6.3

1968

7.1

1980

6.8

2001

6.1

1948

6.3

1958

5.5