1991

7.8

1999

8.1

2018

6.7

2020

6.8

2013

6.0

2017

7.3

2016

10.0

2004

0.0

2015

0.0

2004

7.8

2006

6.2

1995

6.8

1974

6.9

1989

8.3

2002

8.0

2004

6.8

1976

7.1

1982

5.6

2007

6.2

1993

6.6