1996

6.4

1989

5.9

1993

4.1

1998

8.2

1994

7.8

1979

6.8

1987

7.7

2005

7.5

1992

5.9

1980

5.6

1995

0.0

1993

8.4

1998

5.2

1990

6.9

2002

7.3