definitely 100+ and the sad part is there arnt many 737 jobs now. There was a mad rush when Jet and to a certain extent spice were also hiring 737TR pilots for a while. But havnt seen much 737TR recruitment lately. Plus these 2 carriers do not have as many 737s on order compared to the number of 320 orders from other airlines.
So I think in the future we would probably see study recruitment for the 320 type rated people compared to the 737 TR people.