1991

7.0

2008

6.1

2020

5.3

2017

8.1

2017

7.8

2015

7.3

2003

7.1

2004

7.3

1993

7.1

2006

6.2

2017

6.0

2001

8.8

2018

6.3

2013

6.9

2008

7.0

1989

6.8

1996

7.4

2009

6.2

2009

6.5

1991

6.5