The modest, steady growth in enrollment that New Canaan Public Schools has seen in the past decade is expected to level out for a period, and possibly decline somewhat, according to new projections that district officials cited Monday night. Overall, the 4,182 students currently enrolled from kindergarten to 12th grade is projected to grow by just two students next academic year, to 4,184, according to Gary Kass, the public schools’ director of human resources. Longer-term projections from the New England School Development Council, a nonprofit organization based in Marlborough, Mass., call for a decrease of about 90 students overall over the next five years—mostly at the middle school level—and further declines over the subsequent five years, Kass said during a regular meeting of the Board of Education. “At Saxe Middle School, the demographer is projecting a very slight increase of three students for next year and at the high school a decrease of seven students,” Kass told board members during the meeting, held in the Wagner Room at New Canaan High School. “So what you can see from what our demographer is projecting is a period of amazingly stable enrollment, when you are talking about a difference year-over-year of under 10 students at each location.