[SI-LIST] Current Return Vias

Dear Experts,
  I understand that I need to provide ground vias next to via explictly for the 
purpose of letting return currents jump between layers.  I know it's a 
requirement for high speed signals, especially differrential signals.  Is this 
also required for low speed single-ended signals (133Mhz or slower)?  
  If this is a requirement, what would be a good signal via to ground via 
ratio? For example,  there are five signal vias within a 1 inch area, how many 
ground vias do I need?
  Thank you
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