2004

6.4

2006

5.8

2001

7.0

2004

6.3

1997

4.5

0.0

1995

5.9

2003

7.1

1998

4.4

1996

5.6

2005

6.3

2008

5.7

2006

6.5

1988

6.1

1990

6.6

1996

6.5

1997

5.2

2000

5.5

1973

7.4

1972

7.4