2008

8.9

2002

7.5

2004

8.6

2010

8.2

1992

8.2

1997

7.3

1993

6.6

1989

8.3

2015

6.7

1980

7.5

1999

7.7

1988

7.6

2003

7.5

2006

8.6

2009

7.9

1995

7.2

2012

7.8

1986

8.5

1992

8.5

2003

8.2