(function numberCountUp() {
    $('.js-countup').each(function () {
        var year = $(this).text();
        $(this).text(year - 80);
        var tempyear = year - 80;
        var self = this;
        var scrollStart = () => {
            if (( $(self).offset().top - 700) < $(window).scrollTop()) {
                var interval = setInterval( () => {
                    if (tempyear < year) {
                        tempyear++;
                        $(self).text(tempyear);
                    } else {
                        clearInterval(interval);
                        return false;
                    }
                }, 15)
            } else {
                window.requestAnimationFrame(scrollStart)
            }
        }
        window.requestAnimationFrame(scrollStart)
    });
})();