1996

6.6

1985

6.9

1981

6.0

2005

6.3

1990

7.4

2001

7.6

1999

7.9

1995

0.0

1989

8.3

1985

4.4

1984

7.2

2001

6.6

1993

5.7

2002

6.5

1981

5.0