1985

6.9

2012

6.6

1993

6.5

1983

7.9

1988

5.7

1994

7.0

1974

6.6

1996

5.8

1988

6.2

2015

6.3

2017

6.1

2003

5.1

2021

9.2

1992

6.8

2013

6.9

2016

5.8

2007

6.9

2016

6.7

2009

5.5

2018

6.3