Table:
canada
oil-producing provinces
central provinces
other provinces

percent

all occupational categories
2.7
4.2
2.4
2.5

managers and senior managers
2.4
3.6
2.2
2.2

professionals
3.4
3.7
3.4
2.9

technical personnel
4.0
6.4
3.6
3.0

trades workers
3.6
7.2
2.7
3.3

apprentices
2.7
3.0
2.4
3.0

sales and marketing personnel
1.9
3.8
1.8
1.4

administrative and office personnel
2.0
2.4
2.0
1.8

production or services workers
2.5
4.2
2.1
2.6

others
2.0
3.8
1.5
2.0

Statement: nationally, positions requiring technical personnel, trades workers and professionals were apparently in greatest demand.
Question: list the top3 occupational categories apparently in greatest demand.
Answer: technical personnel, trades workers, professionals