2001

6.8

1996

5.5

1999

7.9

1988

4.6

1997

8.1

1998

8.2

1988

3.6

1996

7.3

1994

7.8

1991

6.3

1993

8.0

1987

5.6

1992

5.9

1986

5.9

2010

7.9

2010

7.4

1988

4.1

2010

7.9

1991

4.4

1998

3.5

2000

5.3

1993

7.9

2001

7.6

2005

4.4

2001

6.8

2002

4.0

2008

7.7

1984

5.6