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:
List of best-selling albums in the United States
Table title:
More than or equal to 20 million copies
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Artist </th><th colspan=1 rowspan=1 > Album </th><th colspan=1 rowspan=1 > Label </th><th colspan=1 rowspan=1 > Shipments (Sales) </th><th colspan=1 rowspan=1 > Certification </th></tr>
<tr> <td colspan=1 rowspan=1 > 1976 </td><td colspan=1 rowspan=1 > Eagles </td><td class="highlighted"  colspan=1 rowspan=1 > Their Greatest Hits (1971–1975) </td><td colspan=1 rowspan=1 > Asylum </td><td colspan=1 rowspan=1 > 38,000,000 </td><td colspan=1 rowspan=1 > 38× Platinum </td></tr>
<tr> <td colspan=1 rowspan=1 > 1982 </td><td class="highlighted"  colspan=1 rowspan=1 > Michael Jackson </td><td class="highlighted"  colspan=1 rowspan=1 > Thriller </td><td colspan=1 rowspan=1 > Epic </td><td colspan=1 rowspan=1 > 33,000,000 </td><td colspan=1 rowspan=1 > 33× Platinum </td></tr>
<tr> <td colspan=1 rowspan=1 > 1976 </td><td colspan=1 rowspan=1 > Eagles </td><td colspan=1 rowspan=1 > Hotel California </td><td colspan=1 rowspan=1 > Asylum </td><td colspan=1 rowspan=1 > 26,000,000 </td><td colspan=1 rowspan=1 > 26× Platinum </td></tr>
<tr> <td colspan=1 rowspan=1 > 1971 </td><td colspan=1 rowspan=1 > Led Zeppelin </td><td colspan=1 rowspan=1 > Led Zeppelin IV </td><td colspan=1 rowspan=1 > Atlantic </td><td colspan=1 rowspan=1 > 23,000,000 </td><td colspan=1 rowspan=1 > 23× Platinum </td></tr>
<tr> <td colspan=1 rowspan=1 > 1980 </td><td colspan=1 rowspan=1 > AC/DC </td><td colspan=1 rowspan=1 > Back in Black </td><td colspan=1 rowspan=1 > Atlantic </td><td colspan=1 rowspan=1 > 22,000,000 </td><td colspan=1 rowspan=1 > 22× Platinum </td></tr>
<tr> <td colspan=1 rowspan=1 > 1977 </td><td colspan=1 rowspan=1 > Fleetwood Mac </td><td colspan=1 rowspan=1 > Rumours </td><td colspan=1 rowspan=1 > Warner Bros. </td><td colspan=1 rowspan=1 > 20,000,000 </td><td colspan=1 rowspan=1 > 20× Platinum </td></tr>
</table>
Question:
What was the best-selling album in the U.S. before Michael Jackson's Thriller, and for how long did it hold this record?
Answer:
Their Greatest Hits was the best-selling album in the United States, and it stayed the best-selling album in the U.S. for some years (1971–1975), until it was surpassed by Michael Jackson's Thriller.