2006

5.7

1983

4.5

1998

6.0

2010

6.8

2009

7.5

2006

6.7

1972

6.4

2010

7.9

1995

6.3

2016

7.3

2003

5.8

2011

6.0

2015

6.9

1993

4.8

1993

7.6

1977

6.7

2011

4.6

1985

5.3

2017

5.5

1981

6.5