1989

6.6

2006

3.0

2006

6.9

1990

6.0

2005

6.5

2001

6.7

2003

9.6

1990

6.2

1993

8.2

1974

8.0

2001

7.0

1997

8.6

1986

7.5

1997

5.6

2005

6.8

1982

6.8

1979

7.1

2001

0.0

2005

0.0

1960

5.7