Our revenue has shot up by 30%.
Our gross sales have surged by 30%.
surge v. 急遽上升
The conversion rate fell by 30%.
The rate of conversion dwindled by 30%.
dwindle v. 降低
Orders went down in May but recovered in June but we still don't have any idea why.
Orders plummeted in May but thankfully recovered in June but we still have yet to ascertain the cause.
plummet v. 暴跌
ascertain v. 確定