protected String toParamString() {
		String parameters = "";
		if (Lang.English != lang) {
			parameters += "&lang=E";
		}
		if (null != surveyYears) {
			parameters += "&surveyYears=" + urlEncode(surveyYears);
		}
		if (null != openYears) {
			parameters += "&openYears=" + urlEncode(openYears);
		}
		if (null != statsField) {
			parameters += "&statsField=" + urlEncode(statsField);
		}
		if (null != statsCode) {
			parameters += "&statsCode=" + urlEncode(statsCode);
		}
		if (null != searchWord) {
			parameters += "&searchWord=" + urlEncode(searchWord);
		}
		if (null != searchKind) {
			parameters += "&searchKind=" + urlEncode(searchKind);
		}
		if (null != statsNameList) {
			parameters += "&statsNameList=" + urlEncode(statsNameList);
		}
		return parameters;
	}