48 2026-05-31  172
49 2026-06-30   20
50 2026-07-31  -23
51 2026-08-31  162
52 2026-09-30   29
> summary(USPEM)
      hist                 PEM        
 Min.   :2022-06-30   Min.   :-140.0  
 1st Qu.:2023-07-23   1st Qu.:  60.0  
 Median :2024-08-15   Median : 183.0  
 Mean   :2024-08-14   Mean   : 170.9  
 3rd Qu.:2025-09-07   3rd Qu.: 261.5  
 Max.   :2026-09-30   Max.   : 528.0