1998

6.4

1972

7.4

1995

6.3

1995

5.9

1994

6.7

1992

6.3

1982

6.8

2003

6.3

2003

6.5

2006

4.8

2005

6.9

2004

6.8

2006

4.3

1978

6.3

1991

6.2

1984

6.1

1994

5.2

1996

5.4

1997

6.5

2006

6.2