Here are the solutions to each level, or “Year” of this game, as screenshots.
Year 1

Year 2

Year 3

Year 4

Year 5

Year 6

Year 7

Year 8

Year 9

Year 10

Year 11

Year 12

Year 13

Year 14

Year 15

Year 16

Year 17

Year 18

Year 19

Year 20

Year 21
I am not spoiling what happens in this level, but you only have to click to see the buildings placed automatically, so there’s no need for any particular solution.
By Thia