Going crazy trying to figure out lean beef protein %

I'm buying Top Sirloin, there is almost no fat in the cuts I'm getting, I just add the fat on top of what I weight of lean meat, so let's say is 95% lean, I believe it loses water and weight when cooked and I do cook it in different ways so I would like to figure out how much protein does it have per 100g of raw 95% lean beef, internet says 18-32g 😣😣 please help I been counting it as 25g.