2004

7.8

2006

6.2

1995

6.8

2006

6.1

1974

6.9

1989

8.3

2002

8.0

1985

5.3

2004

6.8

1976

7.1

1982

5.6

2007

6.2

1993

6.6

2005

7.5

1978

6.8

1993

6.5

1973

8.0

1996

5.4

1987

4.3

1998

7.9