FFO (funds from operations) can be estimated as operating cash flow before working-capital movements:

- Cash flows from operations before changes in working capital, 2022: €1,062.464 million  
- Net debt estimate at year-end 2022:
  - Noncurrent financial liabilities: €4,722.263 million
  - Current financial liabilities: €619.418 million
  - Cash and cash equivalents / net cash: €559.908 million
  - Net debt = 4,722.263 + 619.418 − 559.908 = €4,781.773 million

FFO / Net debt:

\[
\frac{1{,}062.464}{4{,}781.773} = 0.2222
\]

So the estimated FFO / Net debt ratio for 2022 is about 22.2%.

<answer>0.222</answer>