New Delhi, Oct. 16 -- India's headline unemployment rate increased to 5.3% in September, the highest since June, according to Periodic Labour Force Survey (PLFS) data published by the National Statistics Office (NSO) on Wednesday. The rate was 5.6% in June. The September unemployment rate is 20 basis points - one basis point is one hundredth of a percentage point - higher than August, when it was at its lowest value in the monthly series, which started in April this year. Since the series started only in April, it is also not possible to compare the data for the same month year-on-year yet. Labour statistics are usually compared year-on-year because some jobs, such as those in agriculture, are seasonal in nature. The sequential rise in unem...