1993

6.6

2002

6.8

1997

6.0

2003

5.5

1999

6.3

2006

6.5

1985

6.7

1990

7.5

1968

7.5

1985

6.5

2004

6.3

2001

5.3

2003

5.2

2000

5.7

1996

6.6

2008

0.0

1993

6.6

1984

6.9

1996

6.1

1994

5.4