1966

7.4

1987

7.3

1996

6.2

1989

6.5

1997

8.2

1996

7.6

1995

3.3

1993

6.5

1997

7.0

1999

5.3

1994

0.0

1986

5.8

2002

6.5

2003

7.4

1992

3.5

2004

9.0

2000

4.8