2001

6.0

1992

6.3

1998

8.3

1984

6.0

2005

6.8

1968

6.3

1993

6.4

2007

5.6

1994

7.0

1993

6.5

2002

6.7

2001

6.3

2006

6.0

1997

6.6

2001

6.8

2001

2.9

1988

6.3

2000

5.1

2004

6.5

1985

6.7