The total number of reviews published each month in 2018.
The spread of scores for reviews published in 2018.
The proportion of games released this year that are ranked or unranked. To be ranked, a game must have 3 reviews on the site.
This shows how many games have received e.g. 3 reviews, or 4 reviews, or 5 reviews, etc. A lot of games have a small number of reviews.