Is this more job losses than the usual trend? As in what is the average rate of job losses over 15 years?
Farming used to be the vast majority of workers 200 years ago. Farming underwent four and a bit halvings of the workforce percentage between 1900 and 2000.
In raw number terms employment in Agriculture dropped -0.65% a year when population was growing 2.8% a year.
So that's a bit over .65% of farm workers a year leave the sector. Not move from horse powering job to tractor pulling job but leave agriculture. So loss of individual agriculture job has been well over .65% per year for 100 years.
Over the 100 years agriculture was mechanised, refrigerated, nitrogen fertilised, pesticised, green revolutioned, factory farmed and GMOed. A lot happened.
To lose 30% of jobs in 15 years 2.35% of the jobs would have to lost each year.
That projected rate of job losses does seem to be a good bit higher than the loss for agriculture for last 100 years.