PGF and TikZ -- Graphic systems for TeX

There's a somehow embarassing mistake in the PGF documentation for version
2.0: On page 70 you refer to a 3D pie chart and state:

The area of "Wind" is slightly smaller than the area of
"Mineralölprodukte" although
the percentage of Wind is nearly three times larger than the percentage
of Mineralölprodukte.

This is incorrect, because the wind doesn't cover 4.4 % of the overall
energy but are 4.4 % of the 9.4 % renewable energy. You also see this when
you sum all percentages. Without the 4.4 % for wind you get exactly 100 %.