1957

8.1

2005

7.3

2017

8.0

1974

7.0

1999

7.2

2013

7.3

1994

7.9

1967

7.5

2014

6.4

1992

5.0

1981

6.5

2001

6.6

2015

6.6

1993

6.9

2017

6.9

2011

6.6

2017

6.6

2012

6.4

1964

7.2

2015

7.7