Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Dou dizhu
Table title:
Popularity
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Popularity in China </th><th colspan=1 rowspan=1 > Source </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2002 </td><td class="highlighted"  colspan=1 rowspan=1 > 50,000 players </td><td colspan=1 rowspan=1 > GICQ(ourgame.com) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2004 </td><td class="highlighted"  colspan=1 rowspan=1 > 100,000 players </td><td colspan=1 rowspan=1 > GICQ(ourgame.com) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2005 </td><td class="highlighted"  colspan=1 rowspan=1 > 17,900,000 players being the loyal fans of the casual game while dou dizhu leading the core place. </td><td colspan=1 rowspan=1 > Chinese Online Game Research Report in 2005 made by iResearch </td></tr>
<tr> <td colspan=1 rowspan=1 > 2006 </td><td colspan=1 rowspan=1 > +1,000,000 online player play it concurrently </td><td colspan=1 rowspan=1 > Tencent QQ game platform in China </td></tr>
<tr> <td colspan=1 rowspan=1 > 2008 </td><td colspan=1 rowspan=1 > roughly 1,450,000 online players per hour in Tencent QQ game platform </td><td colspan=1 rowspan=1 > Tencent QQ game platform in China </td></tr>
<tr> <td colspan=1 rowspan=1 > 2008 </td><td colspan=1 rowspan=1 > roughly 76,000 online players per hour in GICQ </td><td colspan=1 rowspan=1 > GICQ </td></tr>
</table>
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.