2012

3.8

2002

7.5

2017

6.5

2012

9.7

1988

6.7

1975

6.4

2012

8.2

1999

5.1

2015

7.5

1979

7.6

2003

6.3

2011

4.9

2016

6.8

1970

7.3

1987

7.4

2009

7.7

2011

7.8

1998

6.2

2013

6.1

1994

5.9