1981

6.8

2004

6.4

2006

6.5

1996

7.0

2007

5.2

2005

6.8

2006

7.0

1998

5.0

2019

6.8

2000

6.0

2023

8.0

2021

7.7

2006

6.8

2012

0.0

2014

7.4

2014

7.1

1988

7.5

2006

6.8

1988

6.6

2004

6.8