?????????? ???? ????? ???? 2? ??? ??? ???? ????.
1? ????(IB) ??? ??? ?????????? 5? ???(?????)? ???? 2000? ?? ???? ????? 5020? ?? ????? ??? ????. ?????????? 4.7~5.4%? ????? ??? 5.1%? ????? ???. ?? 9? ????? ??? ??? ?????????? 5.2%?? ??? ?? 3000? ?? ????? ???? ??.
1990? 1? ????? ??? ??? ??? ?????? ??? ??? ??? ?????????? 2005? 12? ????? ?? ??????? ?? ???? ????.