New series 2022 sept

[Andywang201605]

Summary

Add incrementalData downloader; add labour force participation rate and nsw fuel price series

Related Issues

123 #171

Checklist

• [x] The change is tested and works locally.
• [x] All related issues are referenced.
• [ ] Blog post included in PR if required e.g. new feature.

[sjtrny]

It would be a good idea to put a warning on the fuel price series explaining how the series is generated and potential problems.