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:
Adaptive Multi-Rate audio codec
Table title:
Usage
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Mode </th><th colspan=1 rowspan=1 > Bitrate (kbit/s) </th><th colspan=1 rowspan=1 > Channel </th><th colspan=1 rowspan=1 > Compatible with </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > AMR_12.20 </td><td class="highlighted"  colspan=1 rowspan=1 > 12.20 </td><td colspan=1 rowspan=1 > FR </td><td colspan=1 rowspan=1 > ETSI GSM enhanced full rate </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > AMR_10.20 </td><td class="highlighted"  colspan=1 rowspan=1 > 10.20 </td><td colspan=1 rowspan=1 > FR </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > AMR_7.95 </td><td class="highlighted"  colspan=1 rowspan=1 > 7.95 </td><td colspan=1 rowspan=1 > FR/HR </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > AMR_7.40 </td><td class="highlighted"  colspan=1 rowspan=1 > 7.40 </td><td colspan=1 rowspan=1 > FR/HR </td><td colspan=1 rowspan=1 > TIA/EIA IS-641 TDMA enhanced full rate </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > AMR_6.70 </td><td class="highlighted"  colspan=1 rowspan=1 > 6.70 </td><td colspan=1 rowspan=1 > FR/HR </td><td colspan=1 rowspan=1 > ARIB 6.7 kbit/s enhanced full rate </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > AMR_5.90 </td><td class="highlighted"  colspan=1 rowspan=1 > 5.90 </td><td colspan=1 rowspan=1 > FR/HR </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > AMR_5.15 </td><td class="highlighted"  colspan=1 rowspan=1 > 5.15 </td><td colspan=1 rowspan=1 > FR/HR </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > AMR_4.75 </td><td class="highlighted"  colspan=1 rowspan=1 > 4.75 </td><td colspan=1 rowspan=1 > FR/HR </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > AMR_SID </td><td colspan=1 rowspan=1 > 1.80 </td><td colspan=1 rowspan=1 > FR/HR </td><td colspan=1 rowspan=1 >  </td></tr>
</table>
Question:
What bitrates do the AMR codecs use?
Answer:
The AMR codec uses eight codecs with bit-rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s.