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What is the percentage of hammock stands made of wood?

What is the percentage of hammock stands made of metal? What type of metal is it?

What is the percentage of hammock stands made of another material?
What material(s) is it?

The above three answers should add up to 100%, and be supported by
multiple, agreeing, reputable sources.

What percentage of hammock stands are single-pole designs?

What percentage of hammock stands are double-pole A-frame designs?

The above three answers should add up to 100% (unless you find that
there are more stand categories), and be supported by multiple,
agreeing, reputable sources.

I also need information on hammock stand dimensions. In particular, I
need to know about the part of the stand that touches the ground. Give
me a percentage breakdown of the dimensions. For example, "65% of
hammock stands have a base that is 48-inches by 48-inches (according
to this source and this source). ... 18-20% of stands are 48-inches by
approximately 72-inches ?" Please factor in all kinds of hammock
stands for this statistic?metal, wood, single pole, double pole. For a
very nice tip, you can provide me statistics not only in general, but
for each category of stand. E.g., ?30% of single pole metal hammock
stands have a base of 30-inches by 64-inches.?

What is the average weight of a hammock stand? In addition to the
average weight among all stand types, I would also like the average
weight of a single pole wooden stand, double pole metal stand, etc.

And finally, for more extra credit (i.e. bigger tip), what percentage
of people living in the United States own at least one hammock? What
percentage of the world population owns at least one hammock? Please
provide your sources of information.