Each year the City shall pay to the Board of Pensions and Retirement, for the account of the fund described in § 22-1001, the City's share of the actuarial cost of financing the Retirement System as required by the Municipal Pension Plan Funding Standard and Recovery Act (1984, Dec. 18, P.L. 1006, No. 205, 53 P.S. §§ 895.101 et seq.) and as may otherwise be required by law, including, without limitation, provisions of USERRA (38 U.S.C. § 4318(b)(1) and (3)) with respect to any liability thereunder of the City, as employer, to the Retirement System. The City shall also contribute the net proceeds of an alternative funding mechanism as defined in 53 P.S. § 895.102 if any alternative funding mechanism is used by the City, for the purposes set forth in 53 P.S. §§ 895.101 et seq. Such contributions shall be made within the time period set forth in 53 P.S. § 895.404.