????? ????????:

??? ????? ???????? ???? ??????? ????? ?? ?????? ??????? ???? ???? ??????? ??? ???????? ?? ??? 50% ??? 90%? ??? ???? ????? ???? ????? ???? ??????? ??? ??????? ??????? ?????? ?? ??????? ??? ???? ????? 23 ??? ???? ???? ?? ??? ???? 1976 ?2012.