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let population = 8110872986; 
const growthRatePerSecond = 2.4;
const worldPopTxt = document.getElementById('world-pop-txt');

function formatNumber(num) {
    return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

function updatePopulation() {
    const secondsSinceLoad = (new Date().getTime() - startTime) / 1000;
    const currentPopulation = population + (secondsSinceLoad * growthRatePerSecond);
    worldPopTxt.textContent = formatNumber(Math.floor(currentPopulation));
}

const startTime = new Date().getTime();
updatePopulation();
setInterval(updatePopulation, 1000);