1996

6.8

1972

6.3

2002

6.2

1988

6.3

2003

6.5

1996

5.7

1994

6.7

2009

6.7

1971

7.1

2000

0.0

1996

6.7

2007

6.9

2008

6.7

2006

6.7

2001

6.0

1972

6.5

2006

6.5

2005

5.7

1989

6.1

2002

6.3