# Percentage

{% hint style="success" %}
This is the official documentation of the `forestadmin-agent-django` and `forestadmin-agent-flask` Python agents.
{% endhint %}

![Percentage Chart example](https://2921382565-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F2HgnlEINLUAEQC1KgN48%2Fuploads%2Fgit-blob-159b56e55b9ec17e277a0ecf21245ffe30988355%2Fchart-percentage.png?alt=media)

Percentage Charts are very similar to value charts. The range of valid values to be returned is from 0 to 100.

```python
from forestadmin.datasource_toolkit.context.agent_context import AgentCustomizationContext
from forestadmin.datasource_toolkit.decorators.chart.result_builder import ResultBuilder
from forestadmin.datasource_toolkit.interfaces.chart import Chart

async def average_volume_increase_chart_fn(
    context: AgentCustomizationContext, result_builder: ResultBuilder
) -> Chart:
    return result_builder.percentage(11)

agent.add_chart("averageVolumeIncrease", average_volume_increase_chart_fn)
```