2000

6.8

2009

5.4

2008

4.4

1998

7.8

1972

6.2

1976

8.0

1984

6.5

1947

5.0

1980

4.8

1989

7.1

2016

6.7

2016

7.0

1974

7.2

1963

7.0

2008

4.1

1973

7.0

2013

5.2

2011

10.0

1988

6.8

1944

6.0