Copy directly from SSS website's My.SSS > Member Information > My Contributions. Make sure to select "100 entries per page" and do not include the header row. Expected format: Year followed by 12 monthly contribution amounts, tab-separated. Header rows are ignored automatically.
Since January 2021, Monthly Salary Credits above ₱20,000 go to your MPF — a separate defined-contribution account that does not affect your monthly pension formula.