Let’s work through this step-by-step.  

**1. Identify EBITDA for 2022 and 2021**  
From the data:
- "Comparable EBITDA" 2022: 2,436 million EUR  
- "Comparable EBITDA" 2021: 2,016 million EUR  

S&P typically uses reported or adjusted EBITDA, and here "Comparable EBITDA" is the closest to S&P-adjusted EBITDA.  

**2. Identify Net Debt for both years**  
Net Debt = Total interest-bearing debt – Cash & equivalents.  

From balance sheet items:
- **2022:**  
  - Non-current financial liabilities: 3,658M  
  - Current financial liabilities: 4,127M  
  - Liquid funds: 3,919M  
  Net Debt = (3,658 + 4,127) – 3,919 = **3,866M EUR**  

- **2021:**  
  - Non-current financial liabilities: 8,701M  
  - Current financial liabilities: 8,519M  
  - Liquid funds: 7,592M  
  Net Debt = (8,701 + 8,519) – 7,592 = **9,628M EUR**  

**3. Calculate Net Debt / EBITDA**  
- 2022: 3,866 / 2,436 ≈ **1.59x**  
- 2021: 9,628 / 2,016 ≈ **4.78x**  

**4. Compare year-on-year**  
The ratio decreased from 4.78x to 1.59x, a drop of ~3.19x. That is far greater than a 0.3x improvement threshold.  

**Conclusion:**  
This is a significant improvement in leverage.  

<answer>Improving</answer>