1988

4.3

1995

5.7

1990

5.4

1993

0.0

1989

3.8

1992

6.5

1999

8.1

2003

5.1

1999

5.9

1998

1.0

1984

0.0

2009

6.0

1997

7.2

1982

6.0

2003

8.0

2002

0.0