This report summarizes the finances of major New York school districts during the school year 1990-91, as well as public school expenditures and state aid since 1972-73. A summary of school district expenditures compares various percentiles of operating expenditures per student and describes the magnitude of the disparity in approved operating expenditures per student between districts in the 10th and 90th percentiles for each year. Decile tables ranked by wealth and expenditures per pupil are provided. Five-year trend data are also presented on full value, expenditures, state aid, tax rates, and local revenue. These items are displayed on a per-pupil basis for the state, New York City, and the remaining school districts. A historical perspective of New York school finances is presented in the appendices. Fifteen tables and a glossary are included. (LMI)