Are review stats from web API outdated?

I'm trying to get summary info about user reviews with web API (for example, for "The Elder Scrolls V: Skyrim"): https://store.steampowered.com/appreviews/72850?json=1&language=all

I get following data:

"total_positive":145480,"total_negative":9413,"total_reviews":154893

But when I'm looking into reviews in the Skyrim page, I see these numbers:

"Customer reviews" information from store.steampowered.com

Why I get different values with API and web-site? Am I doing something wrong? Or API is outdated?

Solution

Aha, purchase_type=all did the trick. I'm just careless.