New Delhi, March 15 -- Just over 3% of Delhi's population has received at least a single dose of the coronavirus vaccine so far, government records show, with experts calling for the government to expedite the vaccination programme in the Capital amid a steady spike in the number of new Covid-19 cases. As on Sunday evening, 638,438 people have received at least one shot of a Covid-19 vaccine in the city, marginally more than 3% of Delhi's 20 million population. Over 178,000 persons over the age of 60 have received at least one shot of the vaccine since the drive opened for them on March 1, state government data showed. This accounts for over 8.5% of the 2.1 million people in this category living in Delhi as per estimates based on electoral rolls....