2011

6.8

2002

7.1

1990

3.7

1998

6.1

1998

5.4

1994

7.6

1996

6.2

2004

5.3

2003

8.2

2003

4.8

1987

4.5

1993

4.6

1995

8.0

1997

6.6

2004

9.0

1992

6.8

1995

6.8