1992

7.2

1990

6.6

1994

6.0

1999

5.0

1989

8.2

2003

6.5

1990

7.2

1984

8.0

2006

7.5

1983

6.0

1989

5.8

2004

6.9

2002

6.1

1998

7.3

2003

8.0

1993

7.4

1999

0.0

1985

6.5

2004

7.0

2003

5.0