1972

0.0

2009

6.7

1995

7.5

1991

6.7

2006

7.1

2005

7.6

1985

6.6

1999

6.0

1977

5.3

1986

6.0

1975

0.0

2000

6.8

1996

6.7

1979

6.5

2001

8.0

1993

7.1

1984

6.3

1994

6.6