2004

8.3

2000

7.2

2006

6.2

1995

6.8

2006

6.1

1974

6.9

1989

9.5

2002

8.0

1985

5.3

2004

6.8

1976

7.1

1982

5.5

2007

8.5

1993

6.6

2005

7.5

2005

8.8

1978

6.8

1993

6.5

1973

8.0

1996

5.3