1967

5.5

2003

6.8

2000

6.0

1988

7.4

1995

6.5

2003

0.0

1994

8.3

2006

7.4

2005

6.6

2002

6.5

1980

5.6

2003

6.5

2002

7.0

1990

6.1

2002

7.0

1990

6.7

2002

6.2

2001

6.8

2005

6.2

1996

5.4