Number of homeless are decreasing

Number of homeless:

2006 - 759,101
2007 - 671,888
2008 - 664,414
2009 - 643,067

During a period in time when you would assume the number of homeless people in total would skyrocket, it has been steadily decreasing. Nobody seems to know why this is happening, but the latest report says "All of the decrease occurred among unsheltered chronically homeless people." This seems to indicate a decrease in the number of street people and people living under bridges. This also seems to correlate with the decrease in funding for programs which support the chronic unsheltered homeless. Is it possible that the lack of support that allows homeless people to survive on the streets is driving them to seek alternatives off the streets?

Sources:
http://www.hudhre.info/documents/2ndHomelessAssessmentReport.pdf
http://www.hudhre.info/documents/3rdHomelessAssessmentReport.pdf
http://www.hudhre.info/documents/4thHomelessAssessmentReport.pdf
http://www.hudhre.info/documents/5thHomelessAssessmentReport.pdf