???????? ?? ??? ??????? ????????????? Electricity?while?????electricity?????} ?????|??????? ??? ?? a ??? ??????? ??????????????|?????? ?? ?? {??|??|??| ???????????? ?? ??? ?? ?? ?? ??? ??? ?? ?? ??????? ?? ????????SQL ???????????|????Google Analytics?_gid cookie ??? ??????????????? although?development??the website?performance? ?? ?? ??? ?? ????? {