Calculate top 25 users

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Dear community, 

I want to calculate the percentage of the top 25 users of a tool I use. 

This way I can show that a small group of users is using the tool.

Columns I got are:

Ranking(most visits) |  amount of visits | % of total of total visits |

I thought about the column, but it isn't working. Can someone help me?

Column  = CALCULATE(TOPN(25,'table',[% of total visits],ASC)

Or I thought about filtering and use a filter 

 column = Filter('table)', 'column,DETAILROWS(25))

% of total visits = the amount of visits user / total visits 

[satichun]

Looking for something similar - % of top 25 against total users.

Did you figure out how to do this?