India import tariff on palm oil. Data is obtained via Bloomberg news stories written on any changes for the import tariff. Unless otherwise stated, the import tariff stays at the same level each month. Repeated values seen monthly on HP are correct as it denotes no change in the level from the source. This index has a time lag of 1 quarter -Methodology: The yearly change is calculated by taking the percentage change for the current quarter over the same quarter of the preceding year. -Changes to Index: Figures up to 4th Quarter 1993 are valued at 1983 Constant Price. History is stored independently for quarterly and yearly frequencies. HP values for these frequencies may not match each other. Note that when only one frequency is stored in history, for the other frequencies, history is derived from that of the stored frequency. For example, HP W, HP M, HP Q and HP Y will derive data from HP D when only daily history is stored, HP Q and HP Y will derive data from HP M when only monthly history is stored. As another example, if both daily and monthly are stored, HP W will derive data from HP D, while HP Q and HP Y will derive data from HP M and so on.