2001

6.9

1979

7.7

1977

7.7

1994

6.8

2004

7.5

2004

5.6

2004

8.1

1987

7.3

1999

7.6

1994

7.5

2005

7.4

1999

6.8

1992

7.7

2001

7.6

1998

6.6

2006

7.1

2006

7.3

2007

6.1

1999

7.8

2003

7.2