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:
List of tallest buildings in China
Table title:
Timeline of tallest buildings
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Floors </th><th colspan=1 rowspan=1 > Year(s) as tallest </th><th colspan=1 rowspan=1 > Height m </th><th colspan=1 rowspan=1 > City </th><th colspan=1 rowspan=1 > Image </th></tr>
<tr> <td colspan=1 rowspan=1 > Union Building </td><td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=1 > 1916-1922 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > Nanfang Building </td><td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > 1922-1927 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Guangzhou </td><td colspan=1 rowspan=1 > Nan Fang Building.JPG </td></tr>
<tr> <td colspan=1 rowspan=1 > Customs House </td><td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > 1927-1929 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > Peace Hotel </td><td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > 1929-1934 </td><td colspan=1 rowspan=1 > 77 </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > Sasson House The Bund.JPG </td></tr>
<tr> <td colspan=1 rowspan=1 > Broadway Mansions </td><td colspan=1 rowspan=1 > 19 </td><td colspan=1 rowspan=1 > 1934-1934 </td><td colspan=1 rowspan=1 > 78 </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > Shanghai Mansion.JPG </td></tr>
<tr> <td colspan=1 rowspan=1 > Park Hotel </td><td colspan=1 rowspan=1 > 24 </td><td colspan=1 rowspan=1 > 1934-1968 </td><td colspan=1 rowspan=1 > 84 </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Guangzhou Hotel </td><td colspan=1 rowspan=1 > 27 </td><td colspan=1 rowspan=1 > 1968-1976 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Guangzhou </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > Baiyun Hotel </td><td class="highlighted"  colspan=1 rowspan=1 > 34 </td><td class="highlighted"  colspan=1 rowspan=1 > 1976-1985 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Guangzhou </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Guomao Building </td><td colspan=1 rowspan=1 > 50 </td><td colspan=1 rowspan=1 > 1985-1990 </td><td colspan=1 rowspan=1 > 160 </td><td class="highlighted"  colspan=1 rowspan=1 > Shenzhen </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > Jing Guang Center </td><td colspan=1 rowspan=1 > 52 </td><td colspan=1 rowspan=1 > 1990-1996 </td><td colspan=1 rowspan=1 > 208 </td><td colspan=1 rowspan=1 > Beijing </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > King Tower </td><td colspan=1 rowspan=1 > 38 </td><td colspan=1 rowspan=1 > 1996-1996 </td><td colspan=1 rowspan=1 > 212 </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > Shun Hing Square </td><td colspan=1 rowspan=1 > 69 </td><td colspan=1 rowspan=1 > 1996-1997 </td><td colspan=1 rowspan=1 > 384 </td><td colspan=1 rowspan=1 > Shenzhen </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > CITIC Plaza </td><td colspan=1 rowspan=1 > 80 </td><td colspan=1 rowspan=1 > 1997-1998 </td><td colspan=1 rowspan=1 > 390 </td><td colspan=1 rowspan=1 > Guangzhou </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > Jinmao Tower </td><td colspan=1 rowspan=1 > 88 </td><td colspan=1 rowspan=1 > 1998-2008 </td><td colspan=1 rowspan=1 > 421 </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > Shanghai World Financial Center </td><td colspan=1 rowspan=1 > 101 </td><td colspan=1 rowspan=1 > 2008-2015 </td><td colspan=1 rowspan=1 > 492 </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > - </td></tr>
<tr> <td colspan=1 rowspan=1 > Shanghai Tower </td><td colspan=1 rowspan=1 > 128 </td><td colspan=1 rowspan=1 > 2015-present </td><td colspan=1 rowspan=1 > 632 </td><td colspan=1 rowspan=1 > Shanghai </td><td colspan=1 rowspan=1 > - </td></tr>
</table>
Question:
What were the tallest buildings in China between 1968 and 1990?
Answer:
Standing tall with 34 floors, Baiyun Hotel surpassed Guangzhou Hotel, to be the tallest building in China in 1976 and remained so until 1985, when it was surpassed by Guomao Building in Shenzhen.