2006

6.5

1978

6.3

2002

6.1

1995

7.1

2005

6.3

1998

6.9

2004

6.5

1998

6.3

2004

7.1

2000

6.8

2008

6.6

1993

7.3

2000

6.9

2006

6.5

1995

7.0

2003

5.7

1978

6.7

1984

6.8

2004

6.6

1999

7.0