Iwasawa first derived his celebrated formula which describes the growth of the p-exponents of the class groups in a Zp-extension. From an algebraic K-theoretical point of view, the class group is precisely the torsion subgroup of zeroth K-group of the ring of integers of the number field. Therefore, it seems natural to ask for an analogous result for the higher K-groups. In this direction, Coates and Ji-Qin have established an analogue of Iwasawa's result for the higher even K-groups over a cyclotomic Zp-extension. In this talk, we consider variants of the results of Coates, Ji and Qin over more general p-adic Lie extensions.