2011

8.1

2012

7.1

2003

2.0

1981

4.1

2019

7.7

2021

7.5

2004

6.5

2016

6.1

2003

4.8

1992

4.3

1999

6.7

2011

4.8

2006

7.3

2001

6.6

2008

7.6