2007

5.7

2011

5.6

5.3

2017

5.9

1988

6.2

2012

6.3

1986

8.0

2015

7.8

1988

5.7

2011

5.1

2020

6.7

2019

6.5

2012

7.2

2003

7.0

2008

5.8

1997

6.1

1995

7.3

2003

6.5

2017

5.5