Most graphs begin with a base level of: 0 10 100 1000

Zero (0)

Explanation:

Usally, a graph will have the start of either the X or Y axis in 0. In fact, in Cartesian graphs the intersection between the X and Y axis is 0 for both or the coordinate (0,0). In some graphs, where the measure's smallest amount is more than 0 it might more sense to start there though.