1986

8.3

1997

7.7

2021

7.9

2012

8.4

1998

6.8

2002

7.5

2012

6.8

1996

8.0

2014

7.2

2008

7.6

2013

8.1

2001

6.6

2002

7.5

1994

8.4

1999

7.4

2017

8.0

1995

7.6

2012

8.6

2005

7.0

2012

7.1