The sex ratio in the state of Bihar has been on a consistent decline from the year 1901 to 2011. In 1901, the females per 1000 males were actually more, i.e., 1057. Till 1921, the number of females was more than males, but was declining in trend. There were 1019 females per 1000 males in 1921, but after 10 years in 1931, the number went down to 992. However, the trend was up till three decades from 1941 to 1961, the number of females per 1000 males remained 1000, 1000, and 1006, respectively. Thus, post-independence also for two decades, the ratio was at par.
Sadly, after that there is a persistent decline in the number of females in comparison to males. in 1971, the number of females per 1000 were 958 and it decreased to 916 in the year 2011. Below visualisation shows the growth of persons, males, females and sex ratio from 1901-2011. The population is depicted in lakhs (one lakh is equal to 0.1 million).
