Passage: World population has experienced continuous growth since the end of the Great Famine of 1315 -- 17 and the Black Death in 1350, when it was near 370 million. The highest population growth rates -- global population increases above 1.8 % per year -- occurred between 1955-1975 peaking to 2.06 % between 1965-1970. The growth rate has declined to 1.18 % between 2010-2015 and is projected to decline to 0.13 % by the year 2100. Total annual births were highest in the late 1980s at about 139 million, and are now expected to remain essentially constant at their 2011 level of 135 million, while deaths number 56 million per year and are expected to increase to 80 million per year by 2040. World population reached 7 billion on October 31, 2011 according to the United Nations Population Fund, and on March 12, 2012 according to the United States Census Bureau.\n\nQuestion: Based on this passage, when did the world population reached 7 billion? Okie... think carefully first, then make a decision:
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The relevant information is: World population reached 7 billion on October 31, 2011 according to the United Nations Population Fund, and on March 12, 2012 according to the United States Census Bureau. So, the answer is October 31 , 2011 according to the United Nations Population Fund , and on March 12 , 2012 according to the United States Census Bureau.
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