1999

7.9

1995

4.9

1980

6.0

1982

5.9

1997

7.6

1989

6.1

2007

8.0

1996

3.9

1985

5.0

1987

7.3

1982

6.9

1983

6.5

1982

7.5

1995

6.0

1980

6.4