43 2025-12-31   48
44 2026-01-31  126
45 2026-02-28  -92
46 2026-03-31  178
47 2026-04-30  115
> summary(USPEM)
      hist                 PEM        
 Min.   :2022-06-30   Min.   :-140.0  
 1st Qu.:2023-06-15   1st Qu.:  71.5  
 Median :2024-05-31   Median : 199.0  
 Mean   :2024-05-30   Mean   : 180.0  
 3rd Qu.:2025-05-15   3rd Qu.: 263.0  
 Max.   :2026-04-30   Max.   : 528.0