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 West Bengal
Table title:
Chief Ministers of West Bengal
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > No. </th><th colspan=1 rowspan=1 > Name Constituency </th><th colspan=2 rowspan=1 > Tenure </th><th colspan=1 rowspan=1 > Duration </th><th colspan=1 rowspan=1 > Assembly (election) </th><th colspan=2 rowspan=1 > Party (alliance) </th></tr>
<tr> <td colspan=1 rowspan=4 > (2) </td><td colspan=1 rowspan=4 > Bidhan Chandra Roy Bowbazar </td><td colspan=1 rowspan=1 > 26 January 1950 </td><td colspan=1 rowspan=1 > 30 March 1952 </td><td colspan=1 rowspan=4 > 12 years, 156 days (total: 14 years, 158 days) </td><td colspan=1 rowspan=1 > Legislative Assembly (1946–52) (January 1946 election) </td><td colspan=1 rowspan=5 > Indian National Congress </td><td colspan=1 rowspan=5 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 31 March 1952 </td><td colspan=1 rowspan=1 > 5 April 1957 </td><td colspan=1 rowspan=1 > First Assembly (1952–57) (January 1952 election) </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 April 1957 </td><td colspan=1 rowspan=1 > 2 April 1962 </td><td colspan=1 rowspan=1 > Second Assembly (1957–62) (March 1957 election) </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 April 1962 </td><td colspan=1 rowspan=1 > 1 July 1962 </td><td colspan=1 rowspan=2 > Third Assembly (1962–67) (February 1962 election) </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 </td><td colspan=1 rowspan=1 > Prafulla Chandra Sen Arambagh East </td><td colspan=1 rowspan=1 > 9 July 1962 </td><td colspan=1 rowspan=1 > 28 February 1967 </td><td colspan=1 rowspan=1 > 4 years, 234 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > Ajoy Kumar Mukherjee Tamluk </td><td colspan=1 rowspan=1 > 1 March 1967 </td><td colspan=1 rowspan=1 > 21 November 1967 </td><td colspan=1 rowspan=1 > 265 days </td><td colspan=1 rowspan=2 > Fourth Assembly (1967–68) (February 1967 election) </td><td colspan=1 rowspan=1 > Bangla Congress (United Front) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > (1) </td><td colspan=1 rowspan=1 > Prafulla Chandra Ghosh Jhargram </td><td colspan=1 rowspan=1 > 21 November 1967 </td><td colspan=1 rowspan=1 > 19 February 1968 </td><td colspan=1 rowspan=1 > 90 days (total: 250 days) </td><td colspan=1 rowspan=1 > Independent (Progressive Democratic Front) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > – </td><td colspan=1 rowspan=1 > Vacant (President's rule) </td><td colspan=1 rowspan=1 > 20 February 1968 </td><td colspan=1 rowspan=1 > 25 February 1969 </td><td colspan=1 rowspan=1 > 1 year, 5 days </td><td colspan=1 rowspan=1 > Dissolved </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > (4) </td><td colspan=1 rowspan=1 > Ajoy Kumar Mukherjee Tamluk </td><td colspan=1 rowspan=1 > 25 February 1969 </td><td colspan=1 rowspan=1 > 16 March 1970 </td><td colspan=1 rowspan=1 > 1 year, 19 days </td><td colspan=1 rowspan=2 > Fifth Assembly (1969–70) (February 1969 election) </td><td colspan=1 rowspan=1 > Bangla Congress (United Front) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=2 > – </td><td colspan=1 rowspan=2 > Vacant (President's rule) </td><td colspan=1 rowspan=1 > 19 March 1970 </td><td colspan=1 rowspan=1 > 30 July 1970 </td><td colspan=1 rowspan=2 > 1 year, 14 days </td><td colspan=1 rowspan=2 > N/A </td><td colspan=1 rowspan=2 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 30 July 1970 </td><td colspan=1 rowspan=1 > 2 April 1971 </td><td colspan=1 rowspan=1 > Dissolved </td></tr>
<tr> <td colspan=1 rowspan=1 > (4) </td><td colspan=1 rowspan=1 > Ajoy Kumar Mukherjee Tamluk </td><td colspan=1 rowspan=1 > 2 April 1971 </td><td colspan=1 rowspan=1 > 28 June 1971 </td><td colspan=1 rowspan=1 > 87 days (total: 2 years, 6 days) </td><td colspan=1 rowspan=1 > Sixth Assembly (1971) (March 1971 election) </td><td colspan=1 rowspan=1 > Indian National Congress (Democratic Coalition) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > – </td><td colspan=1 rowspan=1 > Vacant (President's rule) </td><td colspan=1 rowspan=1 > 29 June 1971 </td><td colspan=1 rowspan=1 > 20 March 1972 </td><td colspan=1 rowspan=1 > 265 days </td><td colspan=1 rowspan=1 > Dissolved </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 </td><td colspan=1 rowspan=1 > Siddhartha Shankar Ray Malda </td><td colspan=1 rowspan=1 > 20 March 1972 </td><td colspan=1 rowspan=1 > 30 April 1977 </td><td colspan=1 rowspan=1 > 5 years, 41 days </td><td colspan=1 rowspan=1 > Seventh Assembly (1972–77) (March 1972 election) </td><td colspan=1 rowspan=1 > Indian National Congress (Progressive Democratic Alliance) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > – </td><td colspan=1 rowspan=1 > Vacant (President's rule) </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 > Dissolved </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=5 > 6 </td><td colspan=1 rowspan=5 > Jyoti Basu Satgachhia </td><td colspan=1 rowspan=1 > 21 June 1977 </td><td colspan=1 rowspan=1 > 23 May 1982 </td><td colspan=1 rowspan=5 > 23 years, 137 days </td><td colspan=1 rowspan=1 > Eighth Assembly (1977–82) (June 1977 election) </td><td colspan=1 rowspan=8 > Communist Party of India (Marxist) (Left Front) </td><td colspan=1 rowspan=8 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 24 May 1982 </td><td colspan=1 rowspan=1 > 29 March 1987 </td><td colspan=1 rowspan=1 > Ninth Assembly (1982–87) (May 1982 election) </td></tr>
<tr> <td colspan=1 rowspan=1 > 30 March 1987 </td><td colspan=1 rowspan=1 > 18 June 1991 </td><td colspan=1 rowspan=1 > Tenth Assembly (1987–91) (March 1987 election) </td></tr>
<tr> <td colspan=1 rowspan=1 > 19 June 1991 </td><td colspan=1 rowspan=1 > 15 May 1996 </td><td colspan=1 rowspan=1 > Eleventh Assembly (1991–96) (May 1991 election) </td></tr>
<tr> <td colspan=1 rowspan=1 > 16 May 1996 </td><td colspan=1 rowspan=1 > 5 November 2000 </td><td colspan=1 rowspan=2 > Twelfth Assembly (1996–2001) (May 1996 election) </td></tr>
<tr> <td colspan=1 rowspan=3 > 7 </td><td colspan=1 rowspan=3 > Buddhadeb Bhattacharya Jadavpur </td><td colspan=1 rowspan=1 > 6 November 2000 </td><td colspan=1 rowspan=1 > 14 May 2001 </td><td colspan=1 rowspan=3 > 10 years, 188 days </td></tr>
<tr> <td colspan=1 rowspan=1 > 15 May 2001 </td><td colspan=1 rowspan=1 > 17 May 2006 </td><td colspan=1 rowspan=1 > Thirteenth Assembly (2001–06) (May 2001 election) </td></tr>
<tr> <td colspan=1 rowspan=1 > 18 May 2006 </td><td colspan=1 rowspan=1 > 13 May 2011 </td><td colspan=1 rowspan=1 > Fourteenth Assembly (2006–11) (April–May 2006 election) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=2 > 8 </td><td class="highlighted"  colspan=1 rowspan=2 > Mamata Banerjee Bhabanipur </td><td class="highlighted"  colspan=1 rowspan=1 > 20 May 2011 </td><td colspan=1 rowspan=1 > 25 May 2016 </td><td colspan=1 rowspan=2 > 7 years, 345 days </td><td colspan=1 rowspan=1 > Fifteenth Assembly (2011–16) (April–May 2011 election) </td><td colspan=1 rowspan=2 > All India Trinamool Congress </td><td colspan=1 rowspan=2 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 26 May 2016 </td><td class="highlighted"  colspan=1 rowspan=1 > Incumbent </td><td colspan=1 rowspan=1 > Sixteenth Assembly (2016–21) (April–May 2016 election) </td></tr>
</table>
Question:
Who has been serving as Chief Minister of West Bengal since 2011?
Answer:
Mamata Banerjee is serving as the 8th and current Chief Minister of West Bengal and has been since 2011.