1999

7.3

1979

6.9

2002

7.9

2007

7.5

1963

7.7

1985

6.6

2007

7.5

2005

5.8

1998

6.5

1991

6.4

1981

0.0

2001

3.5

2007

4.0

1996

0.0

1988

6.8

2007

4.0

1969

6.5

2007

8.2

1975

6.4

1995

7.8