-- Yes. It is optional here.
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tashiroHi, please help me."The United Nation's Millennium Development Goal is that each country decreases their maternal death rate 75% by 2015."Is "by" dropped from between "rate" and "75%"?
From the previous answer, even though it is over ten years old now, "United Nations's" is incorrect. "s's" does come up in english from time to time, the proper formatting is "s'" or "United Nations'", we drop the extra s in these cases, as the apostrophe without anything following infers the apostrophe s combination.