1965

6.4

1997

4.6

2012

4.3

2002

7.2

1933

7.6

2002

6.7

1978

6.0

1981

3.3

2000

7.3

2003

5.0

2017

6.1

1973

5.8

2012

6.8

2016

5.6

1995

7.0

2007

6.3

1951

7.7

2004

7.5

1992

7.4

1981

7.3