  We analyzed data from the first year of a survey for Near Earth Objects
(NEOs) that we are carrying out with the Dark Energy Camera (DECam) on the
4-meter Blanco telescope at the Cerro Tololo Inter-American Observatory. We
implanted synthetic NEOs into the data stream to derive our nightly detection
efficiency as a function of magnitude and rate of motion. Using these measured
efficiencies and the Solar System absolute magnitudes derived by the Minor
Planet Center for the 1377 measurements of 235 unique NEOs detected, we
directly derive, for the first time from a single observational data set, the
NEO size distribution from 1 km down to 10 meters. We find that there are
10^6.6 NEOs larger than 10 meters. This result implies a factor of ten fewer
small NEOs than some previous results, though our derived size distribution is
in good agreement with several other estimates.
