; and (B) the annual aggregate funding of all programs described in that paragraph that have been extended to the Commonwealth of Puerto Rico during the fiscal year immediately prior to the date of issuance of the Proclamation. (3) Decrease in amount Beginning in the 11th fiscal year after the date of issuance of the Proclamation, the amount of the annual block grants described in paragraph (1), as calculated under paragraph (2), shall decrease at the rate of 10 percent each year. (4) Modification of terms The terms of this subsection may be modified by agreement between the United States and the nation of Puerto Rico. (d) Revision The terms and conditions of subsections (a) and (b) may be revised as part of an agreement under the articles of free association approved under section 312. IV Transition and implementation of statehood status 401. Definitions In this title: (1) Admission date The term admission date means the date on which the Commonwealth of Puerto Rico is admitted as a State of the Union of the United States, as established under section 402(b)(1). (2) Proclamation The term Proclamation means a Presidential proclamation issued under section 402(b)(1). 402. Puerto Rico readiness for statehood; Presidential proclamation; admission into the Union of the United States (a) Assessment of readiness for statehood (1) In general On receipt of a certification of the plebiscite results of the Elections Commission pursuant to section 101(d) in which the statehood status option is favored, the Comptroller General of the United States shall conduct a study on the readiness of the Commonwealth of Puerto Rico for statehood, under which the Comptroller General of the United States shall examine— (A) whether the majority of eligible voters that voted for statehood in the plebiscite reflects a sufficiently stable majority such that it is likely that the majority of the eligible votes would not revert to a minority of eligible voters in a future plebiscite