1999

8.6

1992

8.3

2008

8.2

2005

8.1

1986

8.4

2003

5.0

2009

8.0

2016

8.0

2004

7.0

1991

8.5

2003

6.3

1990

9.0

1989

8.5

2004

5.5

2004

8.1

1992

3.5

2002

4.8

1996

6.0

1992

6.7

2001

6.8