If Inventory Turnover increases over time:
An increasing Inventory Turnover usually indicates the company is more efficiently able to convert its inventory into sales.
If Inventory Turnover decreases over time:
A decreasing Inventory Turnover usually indicates the company is less efficiently able to convert its inventory into sales.
If Inventory Turnover stays the same over time:
An unchanged Inventory Turnover usually indicates the ability of the company to convert its inventory into sales has remained the same.