var value = '75%';

var selects = document.querySelectorAll ('select');

for (var i=0; i<selects.length; i++) {

    var selected = null;

    var select = selects[i];

    var options = select.getElementsByTagName('option');

    for (var j=0; j<options.length; j++) {

        var option = options[j];

        var text = option.innerHTML.toLowerCase();

        if (text == value || text == 'no opina') { selected = option; }

    }

    if (selected) { select.value = selected.value; }

}

document.querySelector('a[href=""]').click();