In the past, the number of sets issued for each group of stamps was between 1.5 to 2 million, and they couldn't be sold out even after many months. Today the number of sets issued is five or six times greater, and they sell out in a day, with supply still not meeting demand.
過去每組郵票發行量在一百五十萬至二百萬套間，好幾個月都賣不完，現在發行量增加五、六倍，一天搶光，還供不應求。