Perepelenok,
$(function() {
var tabs = $(".tab_content");
tabs.each(function(i, parent) {
var obj = {};
$("[data-year]", parent).each(function() {
var el = $(this),
year = $(this).data("year"),
p = obj[year];
if (p) el.appendTo(p);
else obj[year] = el.wrap("<p/>").parent()
})
Object.keys(obj).sort(function(a, b) {
return b - a
}).forEach(function(year) {
obj[year].appendTo(parent)
})
})
});
