1992

6.8

2011

8.5

2002

7.5

1989

8.0

2005

7.0

2013

8.2

1999

8.2

2004

8.6

2009

7.6

2007

7.9

2006

7.9

2008

8.4

2019

8.3

2005

8.2

1992

6.7

2017

8.1

1996

7.7

2006

7.3

2016

6.9

2005

8.3