The sex ratio in Delhi has shown an improvement with the female population being grown by 24.9 per cent while the male population grew at a lesser rate of 18.1 per cent. According to the Primary Census Abstract 2011 released here today, of the overall 21.2 per cent population growth registered during 2001-2011, female population grew by 24.9 per cent while male population grew at 18.1 per cent.