Mumbai, Aug 13 - India's annual rate of inflation fell marginally to minus 1.74 percent percent for the week ending Aug 1 from minus 1.58 percent the week before, according to official data released Thursday.

The rate turned negative for the week ended June 6 for the first time since the new wholesale price index (WPI) series started in 1995.

The inflation rate had last turned negative in 1977. Negative inflation implies that the average wholesale price level was lower during a given week, than it was in the corresponding week a year ago. It does not necessarily reflect retail prices.

Both the price indices for primary articles and manufactured products rose 0.