Decline in Approval Rates

The overall capital approval rates have experienced a decline. Last week, the approval rate was 85%, but it has now dropped to 82%, a statistically significant decrease. Upon initial examination, individual product approval rates either remained constant or increased: - Product 1: Improved from 84% to 85% week over week - Product 2: Steady at 77% week over week - Product 3: Improved from 81% to 82% week over week - Product 4: Consistent at 88% week over week What might be the underlying reasons for this overall decrease?