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HTML 

              
                <table class="chart" style="width:500px;">

    <caption> CSS Pie Chart from HTML Table </caption>

    <thead>
        <tr>
            <th scope="col"> Month </th>
            <th scope="col"> Stats </th>
        </tr>
    </thead>

    <tbody>
        <tr>
            <th scope="row"> 2005 </th>
            <td style="--start: 0; --size: 0.10; --color: rgb(240, 100, 100);"> <span class="data"> 100 </span> </td>
        </tr>
        <tr>
            <th scope="row"> 2010 </th>
            <td style="--start: 0.10; --size: 0.18; --color: rgb(130, 190, 255);"> <span class="data"> 180 </span> </td>
        </tr>
        <tr>
            <th scope="row"> 2015 </th>
            <td style="--start: 0.28; --size: 0.56; --color: rgb(140, 220, 120);"> <span class="data"> 560 </span> </td>
        </tr>
        <tr>
            <th scope="row"> 2020 </th>
            <td style="--start: 0.84; --size: 0.16; --color: rgb(190, 130, 255);"> <span class="data"> 160 </span> </td>
        </tr>
    </tbody>

</table>
!

CSS 

              
                /*
 * CSS Pie Chart from HTML tables.
 *
 * TODO:
 * ~~~~~
 * Do the same without the "--start" variable.
 * Find a way to move the accumulated amount of
 * the "--size" vars to the next TR>TD.
 * Try counters, combinators (~ general sibling
 * and + adjacent sibling) and other techniques.
 */

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100vh;
  background-color: #001;
  color: #fff;
}

@mixin position-fullwidth {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;

  width: 100%;
  height: 100%;

  border-radius: 50%;

  display: flex;
  justify-content: center;
}

.chart {
  display: block;
  margin: 0;
  padding: 0;
  border: 0;

  caption,
  thead,
  tfoot {
    display: none;
  }

  tbody {
    position: relative;

    // Create a circle
    display: block;
    width: 100%;
    height: 0;               // Old hack before "aspect-ratio"
    padding-block-end: 100%; // makes height 100% of the width
    aspect-ratio: 1 / 1;
    border-radius: 50%;

    tr {
      th {
        display: none;
      }

      td {
        @include position-fullwidth();

        transform: rotate( calc( 1turn * var( --start, 0 ) ) );

        background: conic-gradient(
          var( --color, transparent ) 0 calc( 100% * var( --size, 0 ) ),
          transparent 0 100%
        );

        // background-color: var(--color);
        // -webkit-mask-image: conic-gradient(red calc(100% * var(--size)), transparent calc(100% * var(--size)));
        // mask-image: conic-gradient(red calc(100% * var(--size)), transparent calc(100% * var(--size)));

        .data {
          @include position-fullwidth();

          transform: rotate( calc( 0.5turn * var( --size, 0 ) ) );
          // top: -1.5rem;
        }
      }
    }
  }
}
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JS
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