JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = [
    { count: '12', year: '1956' },
    { count: '1', year: '1971' },
    { count: '33', year: '1989' },
    { count: '33', year: '1988' }
];

data.sort(function (x, y) {
    var n = x.count - y.count;
    if (n != 0) {
        return n;
    }

    return x.year - y.year;
});

var i;
for (i = 0; i < data.length; i++) {
    document.write("<p>count:" + data[i].count +
                   " year:" + data[i].year + "</p>");
}