private function getIndivdualChartData(): array
    {
        // Count how many people have events in each country
        $surn_countries = [];
        $a_countries    = $this->placeRepository->statsPlaces('INDI');

        // webtrees uses 3 letter country codes and localised country names, but google uses 2 letter codes.
        foreach ($a_countries as $place) {
            // Consolidate places (Germany, DEU => DE)
            if (array_key_exists($place->country, $this->country_to_iso3166)) {
                $country_code = $this->country_to_iso3166[$place->country];

                if (array_key_exists($country_code, $surn_countries)) {
                    $surn_countries[$country_code] += $place->tot;
                } else {
                    $surn_countries[$country_code] = $place->tot;
                }
            }
        }

        return $this->createChartData($surn_countries);
    }