2004

8.6

2006

8.2

2011

8.5

1994

8.4

2015

8.7

2001

7.4

1997

8.3

2012

8.5

1993

8.1

2012

6.8

2015

8.2

1961

7.8

2013

7.5

2001

7.6

2002

7.5

1999

7.8

2004

7.4

2017

7.1

2013

7.8

2002

7.5