[pax]

DNS ~

The remainder of the article details some of the inherent difficulties with data collection, difficulties which you yourself refer to in your initial paragraph.

As with so many other demographic data-collection efforts, almost everything depends upon how you define your terms at the outset.

*shrug* As I said, absent compelling evidence to the contrary, I'll take Marty's eyeball estimate over even the most rigorous study that may not be measuring the same things with the same definitions.

pax