2006

6.0

2000

7.4

1991

8.1

2003

6.2

1999

8.2

2004

6.0

2001

6.9

1993

6.5

1994

5.8

1986

5.8

1998

7.1

1998

6.5

2001

6.0

2002

4.3

2000

4.8

1983

6.1

1990

7.3

1999

6.4

1997

6.1

2005

6.1