1949

3.8

2008

5.3

2002

7.0

1945

7.7

1995

7.7

2006

7.1

2008

7.0

1990

6.3

1961

7.7

1977

8.0

1992

7.0

1968

3.0

1963

7.0

1981

6.0

1953

7.2

1985

6.3

2017

8.5

2013

7.4

2017

6.4

2017

6.4