[flatheadfan]

Statical analysis is something I have had some experience with. That said, one of the important assumptions of any statical analysis is the "continuity of the statistical universe." In this case there is none. There is no way any conclusion can be determined. These data were gathered over almost a four year period with changes in the statistical membership (respondents entered and left). The only conclusion that can be made is an on-going response to a question posed in 2011 is occurring.

Tom