2001

6.5

1988

5.4

2021

6.5

2017

6.5

2005

6.1

2019

7.7

1970

4.4

2008

6.7

2008

6.8

2006

6.3

2014

7.2

2007

7.4

2003

6.6

2006

6.9

1995

6.9

2001

6.1

1983

8.2

1974

8.6

2017

9.0

1991

4.0