1990

6.0

2007

5.5

1997

7.4

1994

8.4

1997

0.0

2000

7.4

2005

8.2

2003

6.7

1989

5.4

1992

5.9

2003

7.6

2006

5.3

1984

7.3

1995

5.0

1991

7.0

1995

5.4

2002

6.7