Dou dizhu
Popularity

Year
Popularity in China
Source
2002
50,000 players
GICQ(ourgame.com)
2004
100,000 players
GICQ(ourgame.com)
2005
17,900,000 players being the loyal fans of the casual game while dou dizhu leading the core place.
Chinese Online Game Research Report in 2005 made by iResearch
2006
+1,000,000 online player play it concurrently
Tencent QQ game platform in China
2008
roughly 1,450,000 online players per hour in Tencent QQ game platform
Tencent QQ game platform in China
2008
roughly 76,000 online players per hour in GICQ
GICQ

Question: What was the popularity of Dou dizhu like between 2002 and 2005?
Answer: Dou dizhu´s popularity increased substantially, doubling in two years, from around 50,000 players in 2002 to 100,000 in 2004 and 17,900,000 players being the loyal fans of the casual game while dou dizhu leading the core place in 2005.