1997

7.1

2007

6.2

2007

7.2

2005

5.5

2002

6.0

2004

7.1

2014

5.4

2008

4.9

2001

5.6

2017

5.7

2020

7.5

1969

5.0

1992

5.6

2010

5.5

2013

5.5

2001

3.0

1989

6.9

2003

5.3

1980

5.5

2021

7.2