<h1>India's April 2011 Wholesale Price Index Rises 1.3%; Annual Inflation Drops to 8.66% from 9.04% in March.</h1> The Wholesale Price Index (WPI) in India for April 2011 increased by 1.3% to 150.6 from the previous month's 148.6. The annual inflation rate based on WPI was 8.66%, down from 9.04% in March 2011. Primary articles saw a 2.2% rise, with food articles increasing by 2.5%. Fuel and power rose by 1.1%, while manufactured products increased by 1.04%. The final WPI for February 2011 was revised to 148.1, with an inflation rate of 9.54%. A correction in the WPI series affected inflation calculations for March and April 2011.