While I'm at it, do you think the top dotted green line is a coincidence?
The bottom line is just the same trend line in my original post.
The middle line (circled in red) is just a line that is parallel to the bottom line and intersects the mid 70's high.
The top line is also parallel to the bottom line but it's twice as far away from the bottom line as the middle line is.
Seems like a strange coincidence eh?