date (s) conducted   cons plaid cymru lib dem  ukip green others   lead
0         5 may 2011  22.5%       17.9%    8.0%  4.6%  3.4%   6.7%  14.4%
1      14 april 2011    20%         18%      8%    4%    2%     4%    24%
2      30 march 2011    20%         16%      8%    6%    2%     2%    25%
3       8 march 2011    20%         18%      5%    5%    4%     2%    25%
4    26 january 2011    20%         21%      8%    4%    2%     4%    21%
5   22 december 2010    22%         21%      5%    5%    3%     2%    20%
6   24 november 2010    20%         20%      9%    4%    3%     4%    21%
7    27 october 2010    18%         23%      9%    6%    2%     3%    21%
8         3 may 2007  21.4%       21.0%   11.7%  4.0%  3.5%   8.8%   8.6%

Table as JSON:
{"date (s) conducted":{"0":"5 may 2011","1":"14 april 2011","2":"30 march 2011","3":"8 march 2011","4":"26 january 2011","5":"22 december 2010","6":"24 november 2010","7":"27 october 2010","8":"3 may 2007"},"cons":{"0":"22.5%","1":"20%","2":"20%","3":"20%","4":"20%","5":"22%","6":"20%","7":"18%","8":"21.4%"},"plaid cymru":{"0":"17.9%","1":"18%","2":"16%","3":"18%","4":"21%","5":"21%","6":"20%","7":"23%","8":"21.0%"},"lib dem":{"0":"8.0%","1":"8%","2":"8%","3":"5%","4":"8%","5":"5%","6":"9%","7":"9%","8":"11.7%"},"ukip":{"0":"4.6%","1":"4%","2":"6%","3":"5%","4":"4%","5":"5%","6":"4%","7":"6%","8":"4.0%"},"green":{"0":"3.4%","1":"2%","2":"2%","3":"4%","4":"2%","5":"3%","6":"3%","7":"2%","8":"3.5%"},"others":{"0":"6.7%","1":"4%","2":"2%","3":"2%","4":"4%","5":"2%","6":"4%","7":"3%","8":"8.8%"},"lead":{"0":"14.4%","1":"24%","2":"25%","3":"25%","4":"21%","5":"20%","6":"21%","7":"21%","8":"8.6%"}}