2003

6.8

2001

5.7

2005

5.2

1991

8.2

2004

7.9

1992

5.3

2006

5.2

1990

5.7

2002

6.4

1992

6.8

2001

6.9

1996

7.8

2001

8.1

1991

7.7

2002

6.9

2002

4.1

1988

8.3

1993

6.3