2003

6.5

1997

6.2

1975

7.3

2000

4.6

1974

7.8

2002

8.0

1991

7.3

2005

7.1

1971

0.0

1987

6.4

1998

6.8

1992

7.2

1973

3.3

2008

6.7

2005

7.1

1982

7.2

1984

5.2

1995

6.7

1968

7.0

2000

6.2