Total Fertility Rate (TFR) chart by household income from twitter

It’s not mine, but I’m not sure who did it, it floats around on twitter in fertility discussions.  If anyone drops me a line, I’ll add an attribute, or when I find time to dig out a reference.  It is estimated TFR by household income.  I will probably post some variations on this chart showing the percentage of children represented at each level of household income later this week.