The following is the Wholesale Price Index (WPI) of a select list of items with the base year of 1993-94. In other words, all the item prices are made 100 in that year (1993-94). Price in all other year for an item are measured with respect to its price in the base year. For instance, the price of cement went up by 1% in 1994-95 as compared to
1993-94. Similarly, the price of power went up by 3% in 1996-97 as compared to 1993-94.
Which item(s) experienced only one decline in price during the ten-year period?