About 2000s - more of my determining years, mid and late twenties into thirties - my life in the West.
My reason for not having a child is complex, as reasons usually are, but it can be summarize like this: I did not find a possible loving father for my child with whom I could create the required stable and resourceful environment.
Being unwanted child myself, I was never willing to impose such or similar situation onto another being, to satisfy my instinctual needs. I strongly believe that children should be born into love and excellence, and require two deserving parents who are eager to connect with the young human beings emotionally.