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 Uriah Heep members
Table title:
Former
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Image </th><th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Years active </th><th colspan=1 rowspan=1 > Instruments </th><th colspan=1 rowspan=1 > Release contributions </th></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Ken Hensley </td><td colspan=1 rowspan=1 > 1969-1980 </td><td colspan=1 rowspan=1 > keyboardssynthesizersguitarvocals </td><td colspan=1 rowspan=1 > all Uriah Heep releases from ...Very 'Eavy ...Very 'Umble (1970) to Conquest (1980)Live in Europe 1979 (1986)Live at Shepperton '74 (1986)Live on the King Biscuit Flower Hour (1997)The Magician's Birthday Party (2002) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > David Byron </td><td colspan=1 rowspan=1 > 1969–1976 </td><td colspan=1 rowspan=1 > lead vocals </td><td colspan=1 rowspan=1 > all Uriah Heep releases from ...Very 'Eavy ...Very 'Umble (1970) to High and Mighty (1976)Live at Shepperton '74 (1986)Live on the King Biscuit Flower Hour (1997) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Paul Newton </td><td colspan=1 rowspan=1 > 1969–1971 </td><td colspan=1 rowspan=1 > bassbacking vocals </td><td colspan=1 rowspan=1 > ...Very 'Eavy ...Very 'Umble (1970)Salisbury (1971)Look at Yourself (1971) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Alex Napier </td><td colspan=1 rowspan=1 > 1969–1970 </td><td colspan=1 rowspan=1 > drums </td><td colspan=1 rowspan=1 > ...Very 'Eavy ...Very 'Umble (1970) </td></tr>
<tr> <td colspan=1 rowspan=1 > Nigel Olsson </td><td colspan=1 rowspan=1 > Nigel Olsson </td><td colspan=1 rowspan=1 > 1970 </td><td colspan=1 rowspan=1 > drumspercussion </td><td colspan=1 rowspan=1 > ...Very 'Eavy ...Very 'Umble (1970) (two tracks only) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Keith Baker </td><td colspan=1 rowspan=1 > 1970 </td><td colspan=1 rowspan=1 > drums </td><td colspan=1 rowspan=1 > Salisbury (1971) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Ian Clarke </td><td colspan=1 rowspan=1 > 1970–1971 </td><td colspan=1 rowspan=1 > drums </td><td colspan=1 rowspan=1 > Look at Yourself (1971) </td></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Lee Kerslake </td><td colspan=1 rowspan=1 > 1971–19791981–2007 </td><td colspan=1 rowspan=1 > drumspercussionvocals </td><td colspan=1 rowspan=1 > all Uriah Heep releases from Demons and Wizards (1972) to Fallen Angel (1978), and from Abominog (1982) to Magic Night (2004) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Mark Clarke </td><td colspan=1 rowspan=1 > 1971–1972 </td><td colspan=1 rowspan=1 > bassvocals </td><td colspan=1 rowspan=1 > Demons and Wizards (1972) (one track only) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Gary Thain </td><td colspan=1 rowspan=1 > 1972–1975 </td><td colspan=1 rowspan=1 > bass </td><td colspan=1 rowspan=1 > all Uriah Heep releases from Demons and Wizards (1972) to Wonderworld (1974)Live at Shepperton '74 (1986)Live on the King Biscuit Flower Hour (1997) </td></tr>
<tr> <td colspan=1 rowspan=1 > John Wetton </td><td colspan=1 rowspan=1 > John Wetton </td><td colspan=1 rowspan=1 > 1975–1976 </td><td colspan=1 rowspan=1 > bassvocalspiano </td><td colspan=1 rowspan=1 > Return to Fantasy (1975)High and Mighty (1976) </td></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > Trevor Bolder </td><td colspan=1 rowspan=1 > 1976–19811983–2013 </td><td colspan=1 rowspan=1 > bassvocals </td><td colspan=1 rowspan=1 > Firefly (1977)Innocent Victim (1977)Fallen Angel (1978)Conquest (1980)Equator (1985)Live in Europe 1979 (1986)all Uriah Heep releases from Live in Moscow (1988) to Spellbinder (1996), and from Sonic Origami (1998) to Official Bootleg Volume Six: Live at the Rock of Ages Festival Germany 2008 (2013) </td></tr>
<tr> <td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > John Lawton </td><td colspan=1 rowspan=1 > 1976–19791995 (substitute)2001 (guest)2013 (substitute) </td><td colspan=1 rowspan=1 > lead vocals </td><td colspan=1 rowspan=1 > Firefly (1977)Innocent Victim (1977)Fallen Angel (1978)Live in Europe 1979 (1986)The Magician's Birthday Party (2002) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > John Sloman </td><td colspan=1 rowspan=2 > 1979–1981 </td><td colspan=1 rowspan=1 > lead vocalskeyboardspianopercussion </td><td colspan=1 rowspan=2 > Conquest (1980) </td></tr>
<tr> <td colspan=1 rowspan=1 > Chris Slade.JPG </td><td colspan=1 rowspan=1 > Chris Slade </td><td colspan=1 rowspan=1 > drumspercussion </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Gregg Dechert </td><td colspan=1 rowspan=1 > 1980–1981 </td><td colspan=1 rowspan=1 > keyboards </td><td colspan=1 rowspan=1 > "Think It Over" (1980) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > John Sinclair </td><td class="highlighted"  colspan=1 rowspan=1 > 1981–1986 </td><td colspan=1 rowspan=1 > keyboardsbacking vocals </td><td colspan=1 rowspan=2 > Abominog (1982)Head First (1983)Equator (1985) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Peter Goalby </td><td colspan=1 rowspan=1 > 1981–1985 </td><td colspan=1 rowspan=1 > lead vocals </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Bob Daisley </td><td colspan=1 rowspan=1 > 1981–1983 </td><td colspan=1 rowspan=1 > bassbacking vocals </td><td colspan=1 rowspan=1 > Abominog (1982)Head First (1983) </td></tr>
<tr> <td colspan=1 rowspan=1 >  </td><td class="highlighted"  colspan=1 rowspan=1 > Steff Fontaine </td><td class="highlighted"  colspan=1 rowspan=1 > 1986 </td><td colspan=1 rowspan=1 > vocals </td><td colspan=1 rowspan=1 > A Time of Revelation: 25 Years On (1996) </td></tr>
</table>
Question:
In which year did Sinclair leave, and who replaced him on vocals?
Answer:
Sinclair left in 1986, with Steff Fontaine taking over on vocals.