2013

7.7

1994

6.5

1990

7.2

2014

5.5

1950

7.0

1998

8.6

1947

7.5

1960

7.4

2009

7.1

2016

7.4

1984

6.3

2001

8.2

1987

7.0

1937

5.4

2004

6.7

2007

6.5

2016

6.9

2013

6.5