2006

6.0

2000

7.4

1985

7.5

1996

6.1

1996

6.1

1991

5.7

1997

4.5

2006

7.1

1979

6.7

2000

6.4

1995

6.8

2008

4.7

1978

6.4

1997

6.6

1999

6.3

2002

6.0

1983

6.1

1990

7.3

1987

7.3

1989

7.0