The most recent archaeological evidence suggests a consistent pattern of finding between 90-150 individual remains at each of the the major archaeological sites in Mexico City. Based on the age of the city, and the Aztec religious calendar, the math suggests the Aztecs sacrificed 18 to 25 individuals every year. This might go up during times of stress. We have at least one recorded drought when they increased the number of human sacrifices in response.
But in general, this is a much lower number than the popular imagination would have you believe. Another win for archaeology!
