Onwards and Upwards BOL, page-20

Quick question about fuel costs.

Fuel expenses seem to have dropped over the past three years (2019, 3,459; 2020 3,791; then a big drop in 2021 to 2,176 perhaps due to COVID).

I see on the website that Boom contracts are either "wet" (fuel included) or "dry" (no fuel included) but can't find a breakdown in terms of the total number / percentage of each.

Can anyone explain to a novice to the industry whether fuel costs are generally passed on to the customer, or absorbed by the operator, meaning we can expect margin compression? Also, am I correct to guess that the majority of the Boom equipment would run on diesel?

Many thanks, P