Huang Yi-nung has discovered, for example, that in 1329, the first year of the Tianli reign of the Yuan dynasty, more than three million almanacs printed by the government were purchased. In those days, that would have certainly put the almanac at the top of the world bestseller list.
以元朝天曆元年為例，黃一農發現當年全國所賣的官印黃曆高達三百萬本，絕對是該年全世界暢銷書的排行榜冠軍。