The city shall not make water or sewer service allocations or connections to more than one hundred fifty (150) dwelling units outside its corporate boundaries in any calendar year. Water or sewer service shall not be extended to any dwelling unit which is not within the city's adopted sphere of influence and which is not zoned or prezoned consistent with the Redlands general plan or plan for development of the sphere of influence area. Water or sewer service connections made pursuant to this provision which are not used or allocated within a given calendar year may not be carried forward to any future year. (§ 4 of measure N, passed by voters 11-3-1987: § 6 of proposition R, passed by voters 11-7-1978)