1976

6.6

2008

6.8

1995

6.5

1980

6.7

1997

5.7

1999

6.5

1986

7.0

1990

6.7

1996

6.0

2002

6.2

2001

6.8

1978

6.3

1991

6.6

1988

6.2

1928

0.0

1996

7.2

2002

5.6

1995

6.9

2002

6.7

1997

5.2