2008

6.9

2012

5.1

2017

6.7

1978

7.6

2015

6.3

2003

7.8

2016

6.1

2016

7.0

1987

7.5

1994

5.9

2000

6.6

1982

7.9

2013

6.7

1997

6.0

2014

7.4

1999

7.3

2019

6.8

1988

6.3

1993

6.5

2016

5.8