2002

8.5

1993

6.6

2005

7.5

1996

5.4

1987

4.3

1992

6.4

2003

8.2

1988

7.7

1980

5.8

1973

6.6

2003

6.7

2012

7.2

2009

6.2

2007

7.8

2012

5.0

1998

5.8

2012

7.0

2012

6.8

2010

7.2

2011

6.3