Visualization of proportions/ratio over time

I am looking for a smart way to visualize proportions, or ratio, over time in a chart. Since the relation between the variables is more interesting than their individual value, I can't just plot the variables individual values on a line chart, at least not in any way I have tried yet.

One of the problems I am facing is that none of the variables represented in the chart should give the impression of being more "preferable" that the other variables.

All our other visualizations over time are represented with line charts but I can't seem to get this right when it comes to proportions/ratios.

I have two cases where I am looking for a solution for this problem:

Case 1: Scenarios where there are two variables, A and B.

  • A + B will always result in 1.

Case 2: Scenarios where there are more that two variables, i.e. A, B, C and D.

  • A + B + C + D will always result in 1.

Here is an image with some example data: enter image description here

I divided them into two different cases since I figure there might be different approaches for more variables than two.

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