2012

7.2

2014

6.8

1967

7.1

2011

7.1

1989

6.4

2012

6.4

2010

7.7

2017

6.9

1989

7.8

1994

6.6

1985

6.1

1998

7.5

1945

7.6

1983

6.6

1992

6.7

2009

7.6

1952

7.7

1959

8.1

2009

5.6

1981

6.5