1984

7.3

2017

6.9

2010

6.2

2014

6.3

2011

5.2

1993

7.4

2020

6.8

2015

6.1

2006

6.3

2017

8.2

2002

6.0

1972

7.2

1967

6.8

1974

6.3

1997

6.2

1971

7.8

2013

6.6

1940

7.4

2015

5.9

1949

7.1