25+ IP, 2.5+ K/BB (highest # in a season)
This could help explain why hitters are striking out like there is no tomorrow. It was an all time record when there were 125 pitchers with at least 25 IP and at least a 2.5 K/BB ratio. Four years later, the number of pitchers who did that nearly doubled, and it seems likely to continue. While the long term trends might be easy to spot, it is stunning how rapidly some these numbers are moving.