The backlog is computed by taking the number of 'pending' family I-485 application at the end of the period, and divide it by the number of I-485 processed during the period ('approved' + 'denied'). FY2022 is Fiscal Year 2022, which is from Oct 2021 to Sep 2022. Q1, Q2, Q3, Q4 indicates the 4 quarters of the fiscal year.