The index represents the price index of the day.
Week-on-week compares the average from Monday to the current day with last week’s average.
Month-on-month compares the average from the beginning of the month to the current day with last month’s average.
Year-on-year (monthly) compares the average from the beginning of the month to the current day with the same month last year.
Quarter-on-quarter compares the average from the beginning of the quarter to the current day with last quarter’s average.
Year-on-year (annual) compares the average from the beginning of the year to the current day with the same period last year.

The Steel Price Index is updated at 16:30 on each working day.
The Raw Materials Index (excluding billets) is updated at 16:45,
and the Billet Price Index is updated at 17:15.