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:
Generalinspekteur der Marine
Table title:
List of Generalinspekteur der Marine
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > № </th><th colspan=1 rowspan=1 >  </th><th colspan=1 rowspan=1 > Inspector General </th><th colspan=1 rowspan=1 > Took office </th><th colspan=1 rowspan=1 > Left office </th><th colspan=1 rowspan=1 > Time in office </th></tr>
<tr> <td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > Prinz Adalbert of Prussia </td><td colspan=1 rowspan=1 > Admiral Prinz Adalbert of Prussia (1811–1873) </td><td colspan=1 rowspan=1 > 1871 </td><td colspan=1 rowspan=1 > 6 June 1873 † </td><td colspan=1 rowspan=1 > 1–2 years </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > Hans von Koester </td><td class="highlighted"  colspan=1 rowspan=1 > Admiral Hans von Koester (1844–1928) </td><td class="highlighted"  colspan=1 rowspan=1 > 14 March 1899 </td><td class="highlighted"  colspan=1 rowspan=1 > 29 December 1906 </td><td colspan=1 rowspan=1 > 7 years, 290 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 </td><td colspan=1 rowspan=1 > Prinz Heinrich of Prussia </td><td colspan=1 rowspan=1 > Admiral Prinz Heinrich of Prussia (1862–1929) </td><td colspan=1 rowspan=1 > 1 October 1909 </td><td colspan=1 rowspan=1 > 10 August 1918 </td><td colspan=1 rowspan=1 > 8 years, 313 days </td></tr>
</table>
Question:
When did Admiral Hans von Koester hold the office?
Answer:
Admiral Hans von Koester held the office of Generalinspekteur der Marine from 14 March 1899 until 29 December 1906.