1997

7.2

1995

6.0

2006

8.2

2003

6.1

2015

6.2

1994

8.4

2003

0.0

2005

8.2

1993

3.3

2005

5.3

1987

7.7

2003

7.0

1996

7.8

2001

6.3

2007

6.4