To determine the credit trend for Naturgy Energy Group S.A., we follow the S&P methodology for the "Regulated Utilities" and "Unregulated Power and Gas" sectors, as the company is a multi-utility.

### Step 1: Identify Industry
Naturgy is a multi-utility (Regulated/Unregulated Power and Gas).

### Step 2-4: Financial Estimates (2021)
*   **Adjusted_EBITDA (2021):**
    *   Reported EBITDA: 3,529,000,000
    *   No significant non-recurring items noted to adjust.
    *   **Adjusted_EBITDA (2021) = 3,529,000,000 EUR**
*   **FFO (2021):**
    *   Cash interest paid: 488,000,000
    *   Cash taxes paid: 864,000,000
    *   FFO = 3,529,000,000 - 488,000,000 - 864,000,000 = **2,177,000,000 EUR**
*   **Adjusted_Debt (2021):**
    *   Total Financial Liabilities (Current + Non-current): 15,114,000,000 + 1,698,000,000 = 16,812,000,000
    *   Cash and Equivalents: 3,965,000,000
    *   Adjusted_Debt (2021) = 16,812,000,000 - 3,965,000,000 = **12,847,000,000 EUR**

### Step 5-6: 2021 Ratios
*   **Debt/EBITDA:** 12,847,000,000 / 3,529,000,000 = **3.64x**
*   **FFO/Debt:** 2,177,000,000 / 12,847,000,000 = **0.169**

### Step 7-9: Financial Estimates (2022)
*   **Adjusted_EBITDA (2022):**
    *   Reported EBITDA: 4,954,000,000
    *   **Adjusted_EBITDA (2022) = 4,954,000,000 EUR**
*   **FFO (2022):**
    *   Cash interest paid: 520,000,000
    *   Cash taxes paid: 762,000,000
    *   FFO = 4,954,000,000 - 520,000,000 - 762,000,000 = **3,672,000,000 EUR**
*   **Adjusted_Debt (2022):**
    *   Total Financial Liabilities: 13,999,000,000 + 2,302,000,000 = 16,301,000,000
    *   Cash and Equivalents: 3,985,000,000
    *   Adjusted_Debt (2022) = 16,301,000,000 - 3,985,000,000 = **12,316,000,000 EUR**

### Step 10-11: 2022 Ratios
*   **Debt/EBITDA:** 12,316,000,000 / 4,954,000,000 = **2.49x**
*   **FFO/Debt:** 3,672,000,000 / 12,316,000,000 = **0.298**

### Step 12: Trend Classification
*   **Signal 1 (Leverage):** 2.49x - 3.64x = -1.15x. (Threshold: ≤ -0.2x). **Category: Improving.**
*   **Signal 2 (Coverage):** 0.298 - 0.169 = +0.129. (Threshold: ≥ +0.03). **Category: Improving.**

Both signals strongly indicate an improvement in the credit profile due to higher EBITDA and lower net debt.

<answer>Improving</answer>