1990

0.0

2012

0.0

2009

7.0

1997

6.1

1999

6.4

1977

5.3

2008

7.2

2013

7.2

2004

6.2

2016

6.8

2021

6.8

2022

6.3

2003

7.7

2010

6.8

2013

6.7

2004

7.2

1991

7.6

2005

7.4

2006

5.8

1976

6.9