Note:
Spot price - prices quoted for the transactions in spot markets.
Spot price update - update twice a day, morning and afternoon, Monday to Friday.
Daily High - highest price of the day.
Daily Low - lowest price of the day.
Average - Average of the all prices during the day.
change = (X-Y) / Y x 100%. X: last quoted spot price of this item for the day.
Y = close price of this item for previous trading day.