What was the trend in the index of import prices in 2015​

The import price index posted declines throughout most of 2015 and finished the year with an annual decline of 8.3 percent in December—the largest calendar-year decrease in the index since 2008. Excluding petroleum, the import price index decreased at a smaller rate of 3.7 percent.

Explanation:

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.