2008

0.0

2008

6.1

1996

6.4

1978

7.6

2006

6.7

1996

5.6

2007

6.2

1997

7.5

2008

4.8

2009

7.1

1999

6.5

2004

7.2

1996

6.0

1987

6.8

1981

6.5

1960

7.4

1988

7.1

1990

6.4

1985

4.4

1986

6.2