Research Max Validator Change report

Add more info

community-contributions/KPI 11.4 - Research Max Validator Change/report.md

@@ -1,4 +1,5 @@
-This report aims to answer the questions of the KPI 11.4.
+This report aims to answer the questions of the KPI 11.4.  
+Data from eras **[3296, 3944]**
 
 1) After the proposal was executed (#1937365), how quickly did the new validators show up?  
 **It took around 10 days (05/02/2021-15/02/2021) for the number of validators to grow from 47 to 80.**
@@ -15,12 +16,19 @@ This report aims to answer the questions of the KPI 11.4.
 
 5) What happened to the rewards in tJOY and USD terms?
 
-6) Was there a spike in tokens staked, or were they just shifted?
+6) Was there a spike in tokens staked, or were they just shifted?  
+**Looking at the graph of the stake overtime it's possible to see some spikes, up and down, in the amount of tokens staked. 
+Maybe due to the attempt of keeping the 25% total amount of staked tokens in order to maintain the best validator rewards.
+The biggest spikes were:**  
+   - **[18/02/21-19/02/21] from 75M to 86M tJOY**
+   - **[22-02/21] from 79M to 91M**  
+   
+**During this period the validators stake went from 77M to 94M tJOY (an increase of 22.01%)**
 
 7) What happened to the average block time, and blocks per era and session/epoch?
 
-8) Anything else that was noteworthy?
-
+8) Anything else that was noteworthy?  
+**Nothing more to report**
 
 ![Validators Status](https://user-images.githubusercontent.com/7486476/110055445-ddfcf700-7d54-11eb-9df3-f71bbc8c1def.png)