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:
Vladimir Graudyn
Table title:
International competitions
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Competition </th><th colspan=1 rowspan=1 > Venue </th><th colspan=1 rowspan=1 > Position </th><th colspan=1 rowspan=1 > Event </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > 1986 </td><td colspan=1 rowspan=1 > European Championships </td><td colspan=1 rowspan=1 > Stuttgart, West Germany </td><td colspan=1 rowspan=1 > 5th (semis) </td><td colspan=1 rowspan=1 > 800 m </td><td colspan=1 rowspan=1 > 1:47.50 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=3 > 1987 </td><td colspan=1 rowspan=1 > European Indoor Championships </td><td colspan=1 rowspan=1 > Liévin, France </td><td colspan=1 rowspan=1 > 2nd </td><td colspan=1 rowspan=1 > 800 m </td><td colspan=1 rowspan=1 > 1:49.14 </td></tr>
<tr> <td colspan=1 rowspan=1 > World Indoor Championships </td><td colspan=1 rowspan=1 > Indianapolis, United States </td><td colspan=1 rowspan=1 > 2nd </td><td colspan=1 rowspan=1 > 800 m </td><td colspan=1 rowspan=1 > 1:47.68 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > World Championships </td><td colspan=1 rowspan=1 > Rome, Italy </td><td colspan=1 rowspan=1 > 6th (semis) </td><td class="highlighted"  colspan=1 rowspan=1 > 800 m </td><td colspan=1 rowspan=1 > 1:45.36 </td></tr>
<tr> <td colspan=1 rowspan=1 > 1988 </td><td colspan=1 rowspan=1 > Olympic Games </td><td colspan=1 rowspan=1 > Seoul, South Korea </td><td colspan=1 rowspan=1 > 5th (q-finals) </td><td colspan=1 rowspan=1 > 800 m </td><td colspan=1 rowspan=1 > 1:47.07 </td></tr>
</table>
Question:
What year did Vladimir Graudyn perform in the 800m  at the World Championships?
Answer:
Vladimir Graudyn performed in the 800 m at the 1987 World Championships.