2011

7.2

1996

6.4

1997

6.6

2003

0.0

1979

7.0

1980

3.7

1994

7.8

2007

7.3

1992

8.5

1987

5.0

1982

2.0

2001

8.0

1988

3.2

1995

5.3

1982

6.1

1988

5.0