[Bug]: Continent report divides itself by zero

### What went wrong?

Antarctica is broken nobody lives there. Only polar bears.

### Steps to reproduce

1. Run the application
2. Read the report
3. It's wrong

### Expected behaviour

Shouldn't show NaN

### Actual behaviour

Shows NaN

### Severity

Low

### Relevant logs or SQL errors

```shell

```

### Additional information

_No response_