1996

6.4

2005

8.2

2015

7.9

2013

4.5

2004

7.9

2020

5.9

1994

7.8

1991

3.5

2011

7.3

2006

7.5

2014

7.8

2012

6.6

1995

7.3

2001

7.6

2010

6.8

2005

7.5

2003

7.6

1991

5.0

2017

8.1

1996

7.8

2020

6.9

1998

7.1

1998

8.1

1973

6.9

2012

6.6