Randall Munroe of xkcd has this to say about including numbers/statistics in your reporting:

A good rule of thumb might be, “If I added a zero to this number, would the sentence containing it mean something different to me?” If the answer is “no,” maybe the number has no business being in the sentence in the first place.

Many people seem think if they overload their text with figures it’s more  authoritative. It may appear so,  but it won’t be very useful for the reader.  More thoughts on this, and other fun things,  in  this interview.