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 Chief Ministers of Punjab (India)
Table title:
Chief Minister of Punjab (Since 1966)
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > № </th><th colspan=1 rowspan=1 > Name (birth–death); constituency </th><th colspan=1 rowspan=1 > Portrait </th><th colspan=2 rowspan=1 > Party (coalition with) </th><th colspan=3 rowspan=1 > Term of office </th><th colspan=1 rowspan=1 > Elections (Vidhan Sabha) </th><th colspan=1 rowspan=1 > Appointed by(Governor) </th></tr>
<tr> <td colspan=1 rowspan=1 > 5 </td><td colspan=1 rowspan=1 > Giani Gurmukh Singh Musafir (1899–1976) MLC in Vidhan Parishad </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Indian National Congress </td><td colspan=1 rowspan=1 > 1 November 1966 </td><td colspan=1 rowspan=1 > 8 March 1967 </td><td colspan=1 rowspan=1 > 127 days </td><td colspan=1 rowspan=1 > — (3rd) </td><td colspan=1 rowspan=2 > Dharma Vira </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 </td><td class="highlighted"  colspan=1 rowspan=1 > Gurnam Singh (1899–1973) MLA for Qila Raipur </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Akali Dal - Sant Fateh Singh (BJS and CPI) </td><td class="highlighted"  colspan=1 rowspan=1 > 8 March 1967 </td><td class="highlighted"  colspan=1 rowspan=1 > 25 November 1967 </td><td colspan=1 rowspan=1 > 262 days </td><td colspan=1 rowspan=2 > 1967 (4th) </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 </td><td colspan=1 rowspan=1 > Lachhman Singh Gill (1917–1969) MLA for Dharamkot </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Punjab Janta Party (INC) </td><td colspan=1 rowspan=1 > 25 November 1967 </td><td colspan=1 rowspan=1 > 23 August 1968 </td><td colspan=1 rowspan=1 > 272 days </td><td colspan=1 rowspan=1 > D. C. Pavate </td></tr>
<tr> <td colspan=1 rowspan=1 > (iii) </td><td colspan=2 rowspan=1 > Vacant (President's rule) </td><td colspan=2 rowspan=1 > None </td><td colspan=1 rowspan=1 > 23 August 1968 </td><td colspan=1 rowspan=1 > 17 February 1969 </td><td colspan=1 rowspan=1 > 178 days </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > Zakir Hussain </td></tr>
<tr> <td colspan=1 rowspan=1 > (6) </td><td class="highlighted"  colspan=1 rowspan=1 > Gurnam Singh (1899–1973) MLA for Qila Raipur </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=2 >  </td><td colspan=1 rowspan=2 > Shiromani Akali Dal (BJS) </td><td class="highlighted"  colspan=1 rowspan=1 > 17 February 1969 </td><td class="highlighted"  colspan=1 rowspan=1 > 27 March 1970 </td><td colspan=1 rowspan=1 > 1 year, 38 days </td><td colspan=1 rowspan=2 > 1969 (5th) </td><td colspan=1 rowspan=2 > D. C. Pavate </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > Parkash Singh Badal (born 1927) MLA for Giddarbaha </td><td colspan=1 rowspan=1 > ParkashSinghBadal (cropped).JPG </td><td colspan=1 rowspan=1 > 27 March 1970 </td><td colspan=1 rowspan=1 > 14 June 1971 </td><td colspan=1 rowspan=1 > 1 year, 79 days </td></tr>
<tr> <td colspan=1 rowspan=1 > (iv) </td><td colspan=2 rowspan=1 > Vacant (President's rule) </td><td colspan=2 rowspan=1 > None </td><td colspan=1 rowspan=1 > 14 June 1971 </td><td colspan=1 rowspan=1 > 17 March 1972 </td><td colspan=1 rowspan=1 > 277 days </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > Varahagiri Venkata Giri </td></tr>
<tr> <td colspan=1 rowspan=1 > 9 </td><td colspan=1 rowspan=1 > Zail Singh (1916–1994) MLA for Anandpur Sahib </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Indian National Congress </td><td colspan=1 rowspan=1 > 17 March 1972 </td><td colspan=1 rowspan=1 > 30 April 1977 </td><td colspan=1 rowspan=1 > 5 years, 44 days </td><td colspan=1 rowspan=1 > 1972 (6th) </td><td colspan=1 rowspan=1 > D. C. Pavate </td></tr>
<tr> <td colspan=1 rowspan=1 > (v) </td><td colspan=2 rowspan=1 > Vacant (President's rule) </td><td colspan=2 rowspan=1 > None </td><td colspan=1 rowspan=1 > 30 April 1977 </td><td colspan=1 rowspan=1 > 20 June 1977 </td><td colspan=1 rowspan=1 > 51 days </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > B. D. Jatti </td></tr>
<tr> <td colspan=1 rowspan=1 > (8) </td><td colspan=1 rowspan=1 > Parkash Singh Badal (born 1927) MLA for Giddarbaha </td><td colspan=1 rowspan=1 > ParkashSinghBadal (cropped).JPG </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Shiromani Akali Dal (JP) </td><td colspan=1 rowspan=1 > 20 June 1977 </td><td colspan=1 rowspan=1 > 17 February 1980 </td><td colspan=1 rowspan=1 > 2 years, 242 days </td><td colspan=1 rowspan=1 > 1977 (7th) </td><td colspan=1 rowspan=1 > Mahendra Mohan Choudhry </td></tr>
<tr> <td colspan=1 rowspan=1 > (vi) </td><td colspan=2 rowspan=1 > Vacant (President's rule) </td><td colspan=2 rowspan=1 > None </td><td colspan=1 rowspan=1 > 17 February 1980 </td><td colspan=1 rowspan=1 > 6 June 1980 </td><td colspan=1 rowspan=1 > 110 days </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > Neelam Sanjiva Reddy </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > Darbara Singh (1916–1990) MLA for Nakodar </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Indian National Congress (Indira) </td><td colspan=1 rowspan=1 > 6 June 1980 </td><td colspan=1 rowspan=1 > 6 October 1983 </td><td colspan=1 rowspan=1 > 3 years, 122 days </td><td colspan=1 rowspan=1 > 1980 (8th) </td><td colspan=1 rowspan=1 > Jaisukh lal Hathi </td></tr>
<tr> <td colspan=1 rowspan=1 > (vii) </td><td colspan=2 rowspan=1 > Vacant (President's rule) </td><td colspan=2 rowspan=1 > None </td><td colspan=1 rowspan=1 > 6 October 1983 </td><td colspan=1 rowspan=1 > 29 September 1985 </td><td colspan=1 rowspan=1 > 1 year, 358 days </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > Zail Singh </td></tr>
<tr> <td colspan=1 rowspan=1 > 11 </td><td colspan=1 rowspan=1 > Surjit Singh Barnala (1925—2017) MLA for Barnala </td><td colspan=1 rowspan=1 > Surjith singh barnala (cropped).JPG </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Shiromani Akali Dal </td><td colspan=1 rowspan=1 > 29 September 1985 </td><td colspan=1 rowspan=1 > 11 June 1987 </td><td colspan=1 rowspan=1 > 1 year, 255 days </td><td colspan=1 rowspan=1 > 1985 (9th) </td><td colspan=1 rowspan=1 > Arjun Singh </td></tr>
<tr> <td colspan=1 rowspan=1 > (viii) </td><td colspan=2 rowspan=1 > Vacant (President's rule) </td><td colspan=2 rowspan=1 > None </td><td colspan=1 rowspan=1 > 11 June 1987 </td><td colspan=1 rowspan=1 > 25 February 1992 </td><td colspan=1 rowspan=1 > 4 years, 259 days </td><td colspan=1 rowspan=1 > — </td><td colspan=1 rowspan=1 > Zail Singh </td></tr>
<tr> <td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > Beant Singh (1922–1995) MLA for Jalandhar Cantonment </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=3 >  </td><td colspan=1 rowspan=3 > Indian National Congress (Indira) </td><td colspan=1 rowspan=1 > 25 February 1992 </td><td colspan=1 rowspan=1 > 31 August 1995 </td><td colspan=1 rowspan=1 > 3 years, 187 days </td><td colspan=1 rowspan=3 > 1992 (10th) </td><td colspan=1 rowspan=1 > Surendra Nath </td></tr>
<tr> <td colspan=1 rowspan=1 > 13 </td><td colspan=1 rowspan=1 > Harcharan Singh Brar (1922–2009) MLA for Muktsar </td><td colspan=1 rowspan=1 > 31 August 1995 </td><td colspan=1 rowspan=1 > 21 November 1996 </td><td colspan=1 rowspan=1 > 1 year, 82 days </td><td colspan=1 rowspan=3 > B.K.N. Chhibber </td></tr>
<tr> <td colspan=1 rowspan=1 > 14 </td><td colspan=1 rowspan=1 > Rajinder Kaur Bhattal (born 1945) MLA for Lehra </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 > 21 November 1996 </td><td colspan=1 rowspan=1 > 11 February 1997 </td><td colspan=1 rowspan=1 > 82 days </td></tr>
<tr> <td colspan=1 rowspan=1 > (8) </td><td colspan=1 rowspan=1 > Parkash Singh Badal (born 1927) MLA for Lambi </td><td colspan=1 rowspan=1 > ParkashSinghBadal (cropped).JPG </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Shiromani Akali Dal (BJP) </td><td colspan=1 rowspan=1 > 12 February 1997 </td><td colspan=1 rowspan=1 > 26 February 2002 </td><td colspan=1 rowspan=1 > 5 years, 14 days </td><td colspan=1 rowspan=1 > 1997 (11th) </td></tr>
<tr> <td colspan=1 rowspan=1 > 15 </td><td colspan=1 rowspan=1 > Amarinder Singh (born 1942) MLA for Patiala Town </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Indian National Congress </td><td colspan=1 rowspan=1 > 26 February 2002 </td><td colspan=1 rowspan=1 > 1 March 2007 </td><td colspan=1 rowspan=1 > 5 years, 3 days </td><td colspan=1 rowspan=1 > 2002 (12th) </td><td colspan=1 rowspan=1 > J. F. R. Jacob </td></tr>
<tr> <td colspan=1 rowspan=2 > (8) </td><td colspan=1 rowspan=2 > Parkash Singh Badal (born 1927) MLA for Lambi </td><td colspan=1 rowspan=2 > ParkashSinghBadal (cropped).JPG </td><td colspan=1 rowspan=2 >  </td><td colspan=1 rowspan=2 > Shiromani Akali Dal (BJP) </td><td colspan=1 rowspan=1 > 1 March 2007 </td><td colspan=1 rowspan=1 > 14 March 2012 </td><td colspan=1 rowspan=2 > 10 years, 15 days </td><td colspan=1 rowspan=1 > 2007 (13th) </td><td colspan=1 rowspan=1 > S. F. Rodrigues </td></tr>
<tr> <td colspan=1 rowspan=1 > 14 March 2012 </td><td colspan=1 rowspan=1 > 16 March 2017 </td><td colspan=1 rowspan=1 > 2012 (14th) </td><td colspan=1 rowspan=1 > Shivraj Patil </td></tr>
<tr> <td colspan=1 rowspan=1 > (15) </td><td colspan=1 rowspan=1 > Amarinder Singh (born 1942) MLA for Patiala Town </td><td colspan=1 rowspan=1 > - </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Indian National Congress </td><td colspan=1 rowspan=1 > 16 March 2017 </td><td colspan=1 rowspan=1 > Incumbent </td><td colspan=1 rowspan=1 > 2 years, 45 days </td><td colspan=1 rowspan=1 > 2017 (15th) </td><td colspan=1 rowspan=1 > V. P. Singh Badnore </td></tr>
</table>
Question:
What roles has Gurnam Singh served?
Answer:
Gurnam Singh was the Chief Minister of Punjab from 8 March 1967 to 25 November 1967, and again between 17 February 1969 to 27 March 1970.