1989

6.6

2006

3.0

2006

6.9

1990

6.0

2005

6.5

2001

6.7

2003

9.6

1993

8.2

1974

8.0

2001

7.0

1997

8.6

2005

6.8

1982

6.8

2001

0.0

2005

0.0

2006

7.1

1997

7.0

1977

6.3

2006

0.0

1959

7.0