1990

6.1

1986

6.8

2010

4.7

1990

7.4

1988

5.8

1979

6.7

1955

5.6

1987

7.5

2020

6.4

2006

6.2

1988

5.7

1992

7.4

2011

5.9

1988

6.0

1968

6.6

2016

5.9

1966

8.5

1954

7.2

2000

5.8

1941

7.4