If Debt to Equity Ratio increases over time:
An increasing Debt to Equity Ratio usually indicates the general operations of the company may becoming more risky.
If Debt to Equity Ratio decreases over time:
A decreasing Debt to Equity Ratio usually indicates the general operations of the company may becoming less risky.
If Debt to Equity Ratio stays the same over time:
An unchanged Debt to Equity Ratio usually indicates the general operations of the company have become neither more or less risky.