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:
FIFA World Ranking system (1999–2006)
Table title:
Example 1
Table:
<table id='hittask' contenteditable='False'>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Team A </td><td colspan=1 rowspan=1 > Team B </td><td colspan=1 rowspan=1 > Team A </td><td colspan=1 rowspan=1 > Team B </td><td colspan=1 rowspan=1 > Team A </td><td colspan=1 rowspan=1 > Team B </td></tr>
<tr> <th colspan=1 rowspan=1 > Score </th><td class="highlighted"  colspan=2 rowspan=1 > 3 : 1 </td><td colspan=2 rowspan=1 > 1 : 3 </td><td colspan=2 rowspan=1 > 2 : 2 </td></tr>
<tr> <th colspan=1 rowspan=1 > Points for Win/defeat </th><td class="highlighted"  colspan=1 rowspan=1 > +17.4 </td><td colspan=1 rowspan=1 > +2.6 </td><td colspan=1 rowspan=1 > −2.6 </td><td colspan=1 rowspan=1 > +22.6 </td><td colspan=1 rowspan=1 > +7.4 </td><td colspan=1 rowspan=1 > +12.6 </td></tr>
<tr> <th colspan=1 rowspan=1 > Points for Goals Scored </th><td colspan=1 rowspan=1 > +5.4 </td><td colspan=1 rowspan=1 > +2.7 </td><td colspan=1 rowspan=1 > +2.3 </td><td colspan=1 rowspan=1 > +6.2 </td><td colspan=1 rowspan=1 > +4.1 </td><td colspan=1 rowspan=1 > +4.7 </td></tr>
<tr> <th colspan=1 rowspan=1 > Points for Goals Conceded </th><td colspan=1 rowspan=1 > −1.8 </td><td colspan=1 rowspan=1 > −3.6 </td><td colspan=1 rowspan=1 > −4.1 </td><td colspan=1 rowspan=1 > −1.6 </td><td colspan=1 rowspan=1 > −3.1 </td><td colspan=1 rowspan=1 > −2.7 </td></tr>
<tr> <th colspan=1 rowspan=1 > Total </th><td class="highlighted"  colspan=1 rowspan=1 > +21.0 </td><td class="highlighted"  colspan=1 rowspan=1 > +1.7 </td><td colspan=1 rowspan=1 > (0.00) </td><td colspan=1 rowspan=1 > +27.2 </td><td colspan=1 rowspan=1 > +8.4 </td><td colspan=1 rowspan=1 > +14.6 </td></tr>
</table>
Question:
What is the point system of the FIFA World Ranking?
Answer:
As is shown on the table, in the case of a 3:1 win, team A received 21.0 points, since team A earned 17.4 of the total points, and the team B earned 1.7 points.