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:
Cöln-class cruiser
Table title:
Ships of the class
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Builder </th><th colspan=1 rowspan=1 > Laid down </th><th colspan=1 rowspan=1 > Launched </th><th colspan=1 rowspan=1 > Completed </th><th colspan=1 rowspan=1 > Fate </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Cöln </td><td colspan=1 rowspan=1 > Blohm & Voss </td><td colspan=1 rowspan=1 > 1915 </td><td class="highlighted"  colspan=1 rowspan=1 > 5 October 1916 </td><td colspan=1 rowspan=1 > 17 January 1918 </td><td colspan=1 rowspan=1 > Scuttled in Scapa Flow on 21 June 1919 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Dresden </td><td colspan=1 rowspan=1 > Howaldtswerke </td><td colspan=1 rowspan=1 > 1916 </td><td class="highlighted"  colspan=1 rowspan=1 > 25 April 1917 </td><td colspan=1 rowspan=1 > 28 March 1918 </td><td colspan=1 rowspan=1 > Scuttled in Scapa Flow on 21 June 1919 </td></tr>
<tr> <td colspan=1 rowspan=1 > Wiesbaden </td><td colspan=1 rowspan=1 > AG Vulcan </td><td colspan=1 rowspan=1 > 1915 </td><td colspan=1 rowspan=1 > 3 March 1917 </td><td colspan=1 rowspan=8 > N/A </td><td colspan=1 rowspan=1 > Not completed, scrapped in 1920 </td></tr>
<tr> <td colspan=1 rowspan=1 > Magdeburg </td><td colspan=1 rowspan=1 > Howaldtswerke </td><td colspan=1 rowspan=1 > 1916 </td><td colspan=1 rowspan=1 > 17 November 1917 </td><td colspan=1 rowspan=1 > Not completed, scrapped in 1922 </td></tr>
<tr> <td colspan=1 rowspan=1 > Leipzig </td><td colspan=1 rowspan=1 > AG Weser </td><td colspan=1 rowspan=1 > 1915 </td><td colspan=1 rowspan=1 > 28 January 1918 </td><td colspan=1 rowspan=1 > Not completed, scrapped in 1921 </td></tr>
<tr> <td colspan=1 rowspan=1 > Rostock </td><td colspan=1 rowspan=1 > AG Vulcan </td><td colspan=1 rowspan=1 > 1915 </td><td colspan=1 rowspan=1 > 6 April 1918 </td><td colspan=1 rowspan=1 > Not completed, scrapped in 1921 </td></tr>
<tr> <td colspan=1 rowspan=1 > Frauenlob </td><td colspan=1 rowspan=1 > Kaiserliche Werft Kiel </td><td colspan=1 rowspan=1 > 1915 </td><td colspan=1 rowspan=1 > 16 October 1918 </td><td colspan=1 rowspan=1 > Not completed, scrapped in 1921 </td></tr>
<tr> <td colspan=1 rowspan=1 > Ersatz Cöln </td><td colspan=1 rowspan=1 > AG Weser </td><td colspan=1 rowspan=1 > 1916 </td><td colspan=1 rowspan=1 > Not completed, scrapped in 1921 </td></tr>
<tr> <td colspan=1 rowspan=1 > Ersatz Emden </td><td colspan=1 rowspan=1 > AG Weser </td><td colspan=1 rowspan=1 > 1916 </td><td colspan=1 rowspan=1 > Not completed, scrapped in 1921 </td></tr>
<tr> <td colspan=1 rowspan=1 > Ersatz Karlsruhe </td><td colspan=1 rowspan=1 > Kaiserliche Werft Kiel </td><td colspan=1 rowspan=1 > 1916 </td><td colspan=1 rowspan=1 > Not completed, scrapped in 1920 </td></tr>
</table>
Question:
Which ships were completed?
Answer:
Cöln and Dresden, the only two ships to be completed, were launched on 5 October 1916 and 25 April 1917, respectively.