  We present a statistical analysis of the first four seasons from a
"second-generation" microlensing survey for extrasolar planets, consisting of
near-continuous time coverage of 8 deg$^2$ of the Galactic bulge by the OGLE,
MOA, and Wise microlensing surveys. During this period, 224 microlensing events
were observed by all three groups. Over 12% of the events showed a deviation
from single-lens microlensing, and for $\sim$1/3 of those the anomaly is likely
caused by a planetary companion. For each of the 224 events we have performed
numerical ray-tracing simulations to calculate the detection efficiency of
possible companions as a function of companion-to-host mass ratio and
separation. Accounting for the detection efficiency, we find that
$55^{+34}_{-22}\%$ of microlensed stars host a snowline planet. Moreover, we
find that Neptunes-mass planets are $\sim10$ times more common than
Jupiter-mass planets. The companion-to-host mass ratio distribution shows a
deficit at $q\sim10^{-2}$, separating the distribution into two companion
populations, analogous to the stellar-companion and planet populations, seen in
radial-velocity surveys around solar-like stars. Our survey, however, which
probes mainly lower-mass stars, suggests a minimum in the distribution in the
super-Jupiter mass range, and a relatively high occurrence of brown-dwarf
companions.
