Owners: Estimated number of people owning this game. The number might be way too small for new releases and sometimes way too big for games that had free weekend event recently. Read more on About page.
Playtime: Average hours played in total per person that have actually launched this game since March 2009. This time is calculated for the whole lifetime, not for the particular year.
Average score: Average users and metacritic score for all games with this score assigned.
Average playtime: Average lifetime playtime for all games where this data is available.
Games this year: Self-explaining - number of games released this year. Please note that it also includes software, but doesn't include DLC. Only inculdes games with sales data available.
Total copies owned: Refers to total copies of games released this year acquired by users for the lifetime. Includes copies sold, downloaded for free and given out.
This number might be too small for recently released games or too big for games that had a free weekend in the last couple of months.