the sex ratio from from 1901to 1991 has -(remained constant or increased or decreased or not been calculated)
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It has been rapidly declining decade by decade. It widely differs among states and union territories. The major causes for declining sex ratio are: sex ratio at birth, sex-selective abortions, sex ratio of children and sex-differentials in mortality etc.There are three reasons why the sex ratio of populations varies and is rarely equal: differences in mortality rates and life expectancy for women and men. Women, on average, live longer than men. ... This means that all else being equal, we would expect males to account for slightly more than half of the total population.
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