Fooling around with (Microsoft) Excel!  
 

 
I just took some serial numbers from Alembic's Stolen Alembics webpage and some I found in the Showcase section, and graphed it.
 
Interesting to note the slope of the graph. I couldn't find any serials past 2002 so it is hard to say whether they are getting busier or not. :-)
 
EffClef