2017

6.1

2008

6.0

1975

5.0

2005

4.3

1988

6.4

1996

6.1

1996

6.1

1985

6.6

1992

7.3

2000

6.4

2006

6.4

1993

6.7

2008

6.5

2019

0.0

2010

1.8

1984

6.8

2001

6.3

2014

5.5

2021

3.5

2005

6.8