How to compare two most recent events?

[rora8181]

Hello, a search is retrieving following results order by event date

Date                                      value

2023-03-02 22PM            10

2023-03-02 20PM             05

2023-03-02 17PM             25

2023-03-02 06AM             03

Considering  value, I'd like to calculate the % betwen those two (PrevLatest*Latest)/100

(5*10)/100=0.5 "50% "
I'm new on this, any idea on how to achieve it?..this has to be used to raise an alert
many many thanks

[ITWhisperer]

| streamstats latest(value) as previousValues window=2 current=f
| eval percentageChange=100*value/previousValue