1966

8.0

2008

8.9

2013

8.1

2009

7.8

2011

7.8

2015

7.7

2002

7.3

1997

8.1

2018

8.1

2011

7.9

2004

8.1

2016

7.3

1959

8.4

1996

6.8

1964

8.0

2015

7.6

1990

7.6

2015

6.7

2014

8.3

1971

7.8