The taxation-lookup site doesn't offer any aggregated data, however you can find some statistics at the national statistics bureau's website: https://ssb.no/en/

The taxation-lookup site doesn't offer any aggregated data, however you can find some statistics at the national statistics bureau's website: https://ssb.no/en/inntekt-og-forbruk https://ssb.no/en/inntekt-og-forbruk (link to page in English)