1997

7.7

1994

6.2

2001

5.4

1994

6.8

2002

6.7

2002

6.9

2004

6.7

2005

6.0

1995

6.5

2005

6.6

2004

6.4

1984

7.2

1999

7.3

1996

7.4

1993

6.7

1995

8.0

1999

7.6

2002

7.0

2004

7.3

1989

7.4