Creating a column to calculate percentage of total population

[JS-TAWS]

I have used the Report section of Power BI to create a table with a count. The table is for what city customers live in . I've also filtered some of the values to not count due to incorrect formats or unknown values. I want to create another column which will show percentage of total, similar to a pie chart just in table form. The total being all customers excluding the data I have filtered out.

I would appreciate any advice given.

Thank you in advance