For quickly completion the SIGA Survey: Open the Developer Tool of your browser (press F12), go to the Console Tab and Run this script (in 2 separated steps) to get your convenient options selected in all fields.

select-all-inputs-in-siga-survey.js

// First enable JQuery on the page
var jq = document.createElement('script');
jq.src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js";
document.getElementsByTagName('head')[0].appendChild(jq);

// Then, (After Jquery is in page) select your default option
var selectValue = '100%';
$('body > div > div > form > div > div:nth-child(6) > table')
	.find('select > option')
	.filter(function () { return $(this).html() == selectValue; })
	.prop('selected', true);