Dow Jones Industrial Average index declined on Thursday weighed down by disappointing data from US labour market and economic activity. Blue chip index fell 0.21% or 26.41 points and finished at 12,393.45 with 16 of 30 stocks posting loss. Dow index has lost 6.2% on monthly basis. Exxon Mobil shed 1.5% . Surging US stockpiles and crawling economic expansion boost worries that biggest energy provider might decline in market value. On the upside Bank of America erased part of yesterday's loss and climbed by 2.1%.