Statistics about total number of comments (over time)

[wuqui]

I want to retrieve the total number of comments posted on Reddit over time. I've discovered the amazing aggs parameter, am I right to assume that it returns these numbers if I use it without specifying any search parameters?

gen = api.search_comments(
    aggs = 'created_utc',
    frequency = 'month'
)

Plotting the results looks somewhat plausible, I guess:

Any ideas about the drop after the turn of the year by any chance? Changes to the API?

PS: Thanks for this great package!