Niedersachsen - Highcharts Maps

Highcharts Maps demo

HTML

<script src="https://code.highcharts.com/maps/highmaps.js"></script>
<script src="https://code.highcharts.com/maps/modules/exporting.js"></script>

<div id="container"></div>

CSS

#container {
    height: 500px;
    min-width: 310px;
    max-width: 800px;
    margin: 0 auto;
}

.loading {
    margin-top: 10em;
    text-align: center;
    color: gray;
}

JavaScript

(async () => {

    const topology = await fetch(
        'https://code.highcharts.com/mapdata/countries/de/de-ni-all-all.topo.json'
    ).then(response => response.json());

    // Prepare demo data. The data is joined to map using value of 'hc-key'
    // property by default. See API docs for 'joinBy' for more info on linking
    // data and map.
    const data = [
        ['de-ni-03452000-03452501', 10], ['de-ni-03457000-03457501', 11],
        ['de-ni-03458000-03458003', 12], ['de-ni-03458000-03458009', 13],
        ['de-ni-03453000-03453009', 14], ['de-ni-03453000-03453011', 15],
        ['de-ni-03459000-03459025', 16], ['de-ni-03353000-03353041', 17],
        ['de-ni-03153000-03153013', 18], ['de-ni-03458000-03458012', 19],
        ['de-ni-03155000-03155003', 20], ['de-ni-03153000-03153016', 21],
        ['de-ni-03251000-03251002', 22], ['de-ni-03355000-03355037', 23],
        ['de-ni-03459000-03459014', 24], ['de-ni-03459000-03459027', 25],
        ['de-ni-03154000-03154020', 26], ['de-ni-03357000-03357044', 27],
        ['de-ni-03255000-03255002', 28], ['de-ni-04011000-04011000', 29],
        ['de-ni-03254000-03254029', 30], ['de-ni-03255000-03255004', 31],
        ['de-ni-03353000-03353037', 32], ['de-ni-03151000-03151017', 33],
        ['de-ni-03151000-03151018', 34], ['de-ni-03255000-03255508', 35],
        ['de-ni-03255000-03255008', 36], ['de-ni-03255000-03255504', 37],
        ['de-ni-03459000-03459005', 38], ['de-ni-03255000-03255009', 39],
        ['de-ni-03456000-03456018', 40], ['de-ni-03456000-03456005', 41],
        ['de-ni-03352000-03352046', 42], ['de-ni-03151000-03151026', 43],
        ['de-ni-03403000-03403000', 44], ['de-ni-03451000-03451005', 45],
        ['de-ni-03456000-03456015', 46], ['de-ni-03157000-03157006', 47],
        ['de-ni-03455000-03455026', 48], ['de-ni-03454000-03454036', 49],
        ['de-ni-03454000-03454053', 50], ['de-ni-03462000-03462006', 51],
        ['de-ni-03462000-03462012', 52], ['de-ni-03358000-03358017',...