public static function getSectorPercentChange($sectorName, $stocksInSector)
 {
     $yesterdaysSectorHistoricalsDate = SectorHistoricals::getYesterdaysSectorHistoricalsDate();
     $yesterdaysTotalMarketCap = SectorHistoricals::where(['date' => $yesterdaysSectorHistoricalsDate, 'sector' => $sectorName])->pluck('total_sector_market_cap');
     if ($yesterdaysTotalMarketCap > 0) {
         return 100 / $yesterdaysTotalMarketCap * SectorHistoricals::getSectorTotalChange($stocksInSector);
     }
     return 0;
 }