  The Hawking emissivities for the scalar-, vector-, and tensor-mode bulk
gravitons are computed in the full range of the graviton's energy by adopting
the analytic continuation numerically when the spacetime background is
$(4+n)$-dimensional non-rotating black hole. The total emissivity for the
gravitons is only 5.16% of that for the spin-0 field when there is no extra
dimension. However, this ratio factor increases rapidly when the extra
dimensions exist. For example, this factor becomes 147.7%, 595.2% and 3496%
when the number of extra dimensions is 1, 2 and 6, respectively. This fact
indicates that the Hawking radiation for the graviton modes becomes more and
more significant and dominant with increasing the number of extra dimensions.
