Options length and for loop

Why does my for loop stop early on options.length?

by fiddlerjason

HTML

<select id="field19" name="industry">
  <option value="" selected="selected">Please Select Industry…</option>
  <option value="Ad Agency">Ad Agency</option>
  <option value="Agriculture">Agriculture</option>
  <option value="Banking & Financial Services">Banking &amp; Financial Services</option>
  <option value="Business Services">Business Services</option>
  <option value="Charities, Foundations & Non-Profits">Charities, Foundations &amp; Non-Profits</option>
  <option value="Construction">Construction</option>
  <option value="Consumer Products">Consumer Products</option>
  <option value="Education">Education</option>
  <option value="Food & Beverage">Food &amp; Beverage</option>
  <option value="Government">Government</option>
  <option value="Hospitals & Healthcare">Hospitals &amp; Healthcare</option>
  <option value="Insurance">Insurance</option>
  <option value="Legal">Legal</option>
  <option value="Leisure, Sports & Recreation">Leisure, Sports &amp; Recreation</option>
  <option value="Manufacturing">Manufacturing</option>
  <option value="Media">Media</option>
  <option value="Minings & Metals">Minings &amp; Metals</option>
  <option value="Pharmaceuticals & Biotech">Pharmaceuticals &amp; Biotech</option>
  <option value="Real Estate Services">Real Estate Services</option>
  <option value="Retail">Retail</option>
  <option value="Staffing & Recruiting">Staffing &amp; Recruiting</option>
  <option value="Technology">Technology</option>
  <option value="Telecommunications">Telecommunications</option>
  <option value="Transportation">Transportation</option>
  <option value="Utilities">Utilities</option>
  <option value="Other">Other</option>
</select>

JavaScript

(function () {
		var industryOptions = document.getElementsByName("industry")[0].options;

		console.log(industryOptions.length);

		for (var k = 0; k < industryOptions.length; k++) {
			industryOptions.remove(0);
		}

		console.log(industryOptions.length);
})();