Sugar was one of the best nutrients in the 1960s and 1970s, when materials were extremely scarce and quite tight. Only 0.2 kg sugar tickets are given to each person every month. Generally, only brown sugar can be bought by ticket purchase. The demand for refined white sugar and rock sugar is greater. Only women who give birth to children, residents who are seriously ill in hospital, and people who enjoy special offers can buy some with the "special sugar coupons".