5.0

1999

8.0

2016

7.7

1997

6.0

2018

7.6

2011

5.2

1970

5.8

2008

4.5

2001

6.1

2010

5.6

1993

7.0

1996

6.9

2010

7.7

2004

6.2

2021

6.2

2006

5.7