Which data or table are you referring to? "Later" in the list of scores when submitted multiple times (first table)? Note that this is a 30-day window.

Growth of the whole community can be seen in the kaggle notebook: https://www.kaggle.com/felixdietze/hacker-news-score-analysi...

If you're referring to the front-page on HN, it could have been submissions of the second chance pool: https://news.ycombinator.com/item?id=26998308