2008

8.0

2007

8.1

1990

6.0

2015

6.0

2009

4.7

1975

6.4

1977

6.7

2010

6.6

1980

7.8

1999

7.2

1985

4.4

1951

7.9

2013

6.3

2017

6.6

6.1

2016

6.2

2011

7.5

1969

7.7

1984

7.2

2007

6.2