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:
World Congress of Soil Science
Table title:

Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > WCSS </th><th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Location </th></tr>
<tr> <td colspan=1 rowspan=1 > 23rd </td><td colspan=1 rowspan=1 > 2026 </td><td colspan=1 rowspan=1 > Nanjing, China </td></tr>
<tr> <td colspan=1 rowspan=1 > 22nd </td><td colspan=1 rowspan=1 > 2022 </td><td colspan=1 rowspan=1 > Glasgow, Scotland, United Kingdom </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 21st </td><td class="highlighted"  colspan=1 rowspan=1 > 2018 </td><td class="highlighted"  colspan=1 rowspan=1 > Rio de Janeiro, Brazil </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 20th </td><td class="highlighted"  colspan=1 rowspan=1 > 2014 </td><td class="highlighted"  colspan=1 rowspan=1 > Jeju-do Island, South Korea </td></tr>
<tr> <td colspan=1 rowspan=1 > 19th </td><td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > Brisbane, Queensland, Australia </td></tr>
<tr> <td colspan=1 rowspan=1 > 18th </td><td colspan=1 rowspan=1 > 2006 </td><td colspan=1 rowspan=1 > Philadelphia, Pennsylvania, U.S. </td></tr>
<tr> <td colspan=1 rowspan=1 > 17th </td><td colspan=1 rowspan=1 > 2002 </td><td colspan=1 rowspan=1 > Bangkok, Thailand </td></tr>
<tr> <td colspan=1 rowspan=1 > 16th </td><td colspan=1 rowspan=1 > 1998 </td><td colspan=1 rowspan=1 > Montpellier, France </td></tr>
<tr> <td colspan=1 rowspan=1 > 15th </td><td colspan=1 rowspan=1 > 1994 </td><td colspan=1 rowspan=1 > Acapulco, Mexico </td></tr>
<tr> <td colspan=1 rowspan=1 > 14th </td><td colspan=1 rowspan=1 > 1990 </td><td colspan=1 rowspan=1 > Kyoto, Japan </td></tr>
<tr> <td colspan=1 rowspan=1 > 13th </td><td colspan=1 rowspan=1 > 1986 </td><td colspan=1 rowspan=1 > Hamburg, Germany </td></tr>
<tr> <td colspan=1 rowspan=1 > 12th </td><td colspan=1 rowspan=1 > 1982 </td><td colspan=1 rowspan=1 > New Delhi, India </td></tr>
<tr> <td colspan=1 rowspan=1 > 11th </td><td colspan=1 rowspan=1 > 1978 </td><td colspan=1 rowspan=1 > Alberta, Canada </td></tr>
<tr> <td colspan=1 rowspan=1 > 10th </td><td colspan=1 rowspan=1 > 1974 </td><td colspan=1 rowspan=1 > Moscow, Russia </td></tr>
<tr> <td colspan=1 rowspan=1 > 9th </td><td colspan=1 rowspan=1 > 1968 </td><td colspan=1 rowspan=1 > Adelaide, Australia </td></tr>
<tr> <td colspan=1 rowspan=1 > 8th </td><td colspan=1 rowspan=1 > 1964 </td><td colspan=1 rowspan=1 > Bucharest, Romania </td></tr>
<tr> <td colspan=1 rowspan=1 > 7th </td><td colspan=1 rowspan=1 > 1960 </td><td colspan=1 rowspan=1 > Madison, U.S. </td></tr>
<tr> <td colspan=1 rowspan=1 > 6th </td><td colspan=1 rowspan=1 > 1956 </td><td colspan=1 rowspan=1 > Paris, France </td></tr>
<tr> <td colspan=1 rowspan=1 > 5th </td><td colspan=1 rowspan=1 > 1954 </td><td colspan=1 rowspan=1 > Leopoldville, Democratic Republic of the Congo </td></tr>
<tr> <td colspan=1 rowspan=1 > 4th </td><td colspan=1 rowspan=1 > 1950 </td><td colspan=1 rowspan=1 > Amsterdam, Netherlands </td></tr>
<tr> <td colspan=1 rowspan=1 > 3rd </td><td colspan=1 rowspan=1 > 1935 </td><td colspan=1 rowspan=1 > Oxford, England </td></tr>
<tr> <td colspan=1 rowspan=1 > 2nd </td><td colspan=1 rowspan=1 > 1930 </td><td colspan=1 rowspan=1 > Leningrad, Russia </td></tr>
<tr> <td colspan=1 rowspan=1 > 1st </td><td colspan=1 rowspan=1 > 1927 </td><td colspan=1 rowspan=1 > Washington DC, U.S. </td></tr>
</table>
Question:
When and where were the 20th and 21st WCSS held?
Answer:
The 20th WCSS was held in 2014 on Jeju-do Island, South Korea and the 21st WCSS was held in Rio de Janeiro (Brazil) in 2018.