There is a difference between production and availability of foodgrains. This is
estimated as:

Availability of foodgrains for the year = Production of foodgrains during
the year (production – seed, feed and wastage) + net imports (imports – exports) -
change in stocks with the government (closing stock at the year end- opening stock
at the beginning)

Availability of foodgrains per person per day = (Availability of foodgrains
for the year ÷ population)/ 365

Information relating to production, imports and change in government stocks
are given in the following table for three years – 1971, 1991 and 2011. Besides
production, imports are a way of increasing the availability of foodgrains in any
particular year. Another important source of foodgrain availability is the change
in government stocks. The government can, for instance, increase the availability of
rice for the people by selling rice from its existing stocks. While the stocks of
rice with the government reduces, the amount of rice available for consumption in
that year increases. (You will read more about government stocks in the next
section.) As shown for 1971, calculate per person availability of foodgrains for
1991 and 2011.