To determine the S&P's adjusted leverage trend for Naturgy Energy Group SA for the year 2022, we calculate the Net Debt to EBITDA ratio for 2021 and 2022.

**1. EBITDA:**
- **2021:** The reported "Beneficio Bruto De Explotacion Ebitda" (EBITDA) is 3,529,000,000 EUR.
- **2022:** The reported EBITDA is 4,954,000,000 EUR.

**2. Net Debt:**
Net Debt is calculated as the sum of Noncurrent and Current Financial Liabilities minus Cash and Cash Equivalents.
- **2021 (as of 2022-01-01):**
  - Noncurrent Financial Liabilities: 15,114,000,000 EUR
  - Current Financial Liabilities: 1,698,000,000 EUR
  - Cash and Cash Equivalents: 3,965,000,000 EUR
  - *Net Debt (2021)* = 15,114,000,000 + 1,698,000,000 - 3,965,000,000 = 12,847,000,000 EUR

- **2022 (as of 2023-01-01):**
  - Noncurrent Financial Liabilities: 13,999,000,000 EUR
  - Current Financial Liabilities: 2,302,000,000 EUR
  - Cash and Cash Equivalents: 3,985,000,000 EUR
  - *Net Debt (2022)* = 13,999,000,000 + 2,302,000,000 - 3,985,000,000 = 12,316,000,000 EUR

**3. Net Debt / EBITDA Ratio:**
- **2021:** 12,847,000,000 EUR / 3,529,000,000 EUR ≈ 3.64x
- **2022:** 12,316,000,000 EUR / 4,954,000,000 EUR ≈ 2.49x

**4. Gap Calculation and Trend:**
- Gap = 2022 Ratio - 2021 Ratio = 2.49x - 3.64x = -1.15x
- A year-on-year gap of -1.15x represents a strong deleveraging trajectory. Since the gap is lower than -0.3x, the leverage ratio has significantly improved. 

<answer>Improving</answer>