We have lots of statistics on these type things. Unfgortunately our statistics would be geared towards the higher talent level, rather than over all numbers.
Most recently we completed the PG WWBA Championship in Jupiter a couple weeks ago.
There were 85 teams. After averaging out all the fastball velocities of all the pitchers on each team, we found that...
all but two teams averaged over 80 mph.
75 teams averaged over 82 mph.
64 teams averaged over 83 mph.
59 teams averaged over 84 mph.
51 teams averaged over 85 mph.
41 teams averaged over 86 mph.
25 teams averaged over 87 mph.
13 teams averaged over 88 mph.
8 teams averaged over 89 mph.
5 teams averaged over 90 mph.
2 teams averaged over 91 mph.
Out of all those who pitched in that event... 127 topped out at 90 mph or better. 331 pitchers topped out at 87 or above. This was out of 817 pitchers who threw at that event. About 50 of the 817 pitchers topped out below 80 mph. The average top fastball for every pitcher at the 2009 WWBA in Jupiter was 85.25 mph.
Not sure if this information is interesting to anyone or not?