1990

6.0

2007

5.9

1997

7.4

1994

8.4

1997

0.0

2005

8.2

2003

6.7

1989

5.7

1992

5.9

2003

7.6

2006

5.2

1984

7.4

1991

5.5

1995

5.4

2002

6.7