2015

7.8

2016

5.2

2010

8.4

2006

8.2

2008

8.5

1999

8.4

1996

7.7

2015

7.0

2001

7.8

2012

7.8

2005

7.7

1998

8.1

1994

8.3

1985

8.3

1957

8.5

1985

8.2

2011

7.5

1997

7.1

1988

7.4

1979

8.1