46 2026-03-31  178
47 2026-04-30  179
48 2026-05-31  172
49 2026-06-30   20
50 2026-07-31  -23
> summary(USPEM)
      hist                 PEM         
 Min.   :2022-06-30   Min.   :-140.00  
 1st Qu.:2023-07-07   1st Qu.:  64.75  
 Median :2024-07-15   Median : 187.00  
 Mean   :2024-07-15   Mean   : 173.90  
 3rd Qu.:2025-07-23   3rd Qu.: 262.50  
 Max.   :2026-07-31   Max.   : 528.00