From the 1987 NEC section 210-52(B): "In kitchen and dining areas of dwelling units a receptacle outlet shall be installed at each counter space wider than 12 inches. Counter top spaces separated by range tops, refridgerators, or sinks shall be considered as separate counter top spaces. Receptacles rendered inaccessible by appliances fastened in place or appliances occupying dedicated space shall not be considered as theses required outlets."
The 1984 NEC section 210-52(B) reads the same way.
The 1981 NEC section 210-52(B) reads the same way.
The 1978 NEC section 210-25(B) also contains the same verbiage (one interesting note is that section 210-25(A) requires receptacles outlets located "Where flexible cords are used")
Now I have to go back and read the 2008 NEC again or I'll get it all wrong and start enforcing the '78...
Pete