Wall Street finished its final day of 2015 down, marking its worst annual performance in seven years. Oil prices suffered a second year of steep losses and are expected to take at least another year to clear as the international surplus continues. The oil price collapse sent global markets reeling throughout 2015. Shares of US oil giants Chevron and Exxon Mobil were down 0.17 per cent and 0.22 per cent respectively for the day.