1999

7.9

1995

4.9

1980

4.8

1982

5.8

1997

7.5

1989

6.1

2007

6.8

1996

4.0

1985

5.0

1987

7.4

1982

6.9

1983

6.4

1982

7.4

1995

6.0

1980

6.3