invariant measure on a quotient of a topological group

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Suppose I have a locally compact topological group, $G$, and a closed subgroup $H\leq G$. Suppose $\Delta _G|_H = \Delta_H$ where the $\Delta$ are the modular functions on $G$ and $H$. How can I see that there is a $G$-invariant Borel measure on $G/H$ which is unique up to constant coefficient?