How to show missing values in table rows and columns?

Approach 1 Show NA for missing items

enter image description here

Approach 2 Show - sign for missing items enter image description here

I have a table that displays crypto prices, volume etc. There are often times when I don't have data in a particular column. I tried 2 approaches

  1. Show 'NA' for missing items
  2. Show '-' for missing items

What is the right way to do this? Thank you for your answers in advance