1997

4.0

2005

6.0

2021

6.8

2003

4.7

2002

6.2

1992

7.0

2016

6.5

2010

4.6

1978

7.5

2001

5.8

2007

6.6

1995

7.7

2017

6.2

2006

6.0

2008

4.6

2020

1.0

2009

3.8

1985

8.3

2008

4.5

2008

5.6