ratio of girl and boy in world 2017
Human sex ratio In a study around 2002, the natural sex ratio at birth was estimated to be close to 1.06 males/female.[9] Some scholars suggest that countries considered to have significant practices of prenatal sex-selection are those with birth sex ratios of 108 and above (selection against females) and 102 and below (selection against males). This assumption has been questioned by some scholars.[10]
World population 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.[2] The highest population growth rates – global population increases above 1.8% per year – occurred between 1955-1975 peaking to 2.06% between 1965-1970.[1] The growth rate has declined to 1.18% between 2010-2015 and is projected to decline to 0.13% by the year 2100.[1] Total annual births were highest in the late 1980s at about 139 million,[3] and are now expected to remain essentially constant at their 2011 level of 135 million,[4] while deaths number 56 million per year and are expected to increase to 80 million per year by 2040.[5] World population reached 7 billion on October 31, 2011 according to the United Nations Population Fund,[6][7][8] and on March 12, 2012 according to the United States Census Bureau.[9]