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:
GNoSR Classes X and Y
Table title:
Classification and numbering
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Class </th><th colspan=2 rowspan=1 > X </th><th colspan=2 rowspan=1 > Y </th></tr>
<tr> <td colspan=1 rowspan=1 > GNoSR number </td><td colspan=1 rowspan=1 > 114 </td><td colspan=1 rowspan=1 > 115 </td><td colspan=1 rowspan=1 > 116 </td><td colspan=1 rowspan=1 > 117 </td></tr>
<tr> <td colspan=1 rowspan=1 > GNoSR 1915 renumbering </td><td colspan=1 rowspan=1 > 43 </td><td colspan=1 rowspan=1 > 44 </td><td colspan=1 rowspan=1 > 30 </td><td colspan=1 rowspan=1 > 32 </td></tr>
<tr> <td colspan=1 rowspan=1 > LNER number </td><td colspan=1 rowspan=1 > 6843 </td><td colspan=1 rowspan=1 > 6844 </td><td colspan=1 rowspan=1 > 6830 </td><td colspan=1 rowspan=1 > 6832 </td></tr>
<tr> <td colspan=1 rowspan=1 > LNER 1946 renumbering </td><td colspan=1 rowspan=1 > 8190 </td><td colspan=1 rowspan=1 > 8191 </td><td colspan=1 rowspan=1 > 8192 </td><td colspan=1 rowspan=1 > 8193 </td></tr>
<tr> <td colspan=1 rowspan=1 > BR number </td><td colspan=1 rowspan=1 > 68190 </td><td class="highlighted"  colspan=1 rowspan=1 > 68191 </td><td colspan=1 rowspan=1 > 68192 </td><td class="highlighted"  colspan=1 rowspan=1 > 68193 </td></tr>
<tr> <td colspan=1 rowspan=1 > Withdrawn date </td><td colspan=1 rowspan=1 > 28-04-1960 </td><td class="highlighted"  colspan=1 rowspan=1 > 31-03-1959 </td><td colspan=1 rowspan=1 > 28-04-1960 </td><td class="highlighted"  colspan=1 rowspan=1 > 21-04-1956 </td></tr>
<tr> <td colspan=1 rowspan=1 > Total Mileage </td><td colspan=1 rowspan=1 > 457,000 </td><td colspan=1 rowspan=1 > 525,000 </td><td colspan=1 rowspan=1 > 255,000 </td><td colspan=1 rowspan=1 > 196,000 </td></tr>
</table>
Question:
What was the first withdrawn class and which one followed it?
Answer:
The first withdrawn GNoSR Class was 68193 in 1956, followed by 68191 in 1959.