I guess I'm searching for a graph that has time on the x-axis and (real gdp * % of income that went to the bottom z%) on the y-axis for 5 ~ 10 different values

I guess I'm searching for a graph that has time on the x-axis and (real gdp * % of income that went to the bottom z%) on the y-axis for 5 ~ 10 different values of z. And hopefully it trends upwards for all values. I'm just surprised this isn't something that economists have already thought of as it feels like it would be the most important GDP-derived metric. Or at least "GDP per capita on median" if that makes sense.