The charts reflect the Use Years originally designated by Disney up until April 3, 2019, but does not show the valid Use Year for those points that Disney has reacquired and resold to the general public since that date.
Until April 3, 2019, Disney was adhering to the rules that all points in a Residential Unit had to have the same Use Year and that the Use year would never change. Beginning on that date several Copper Creek deeds and an Animal Kingdom Villas deed were sold by Disney with different Use Years than what was originally designated.
I admit the charts are not 100% accurate but they should be close enough to give us a reasonable feel for the availability of a certain Use Year at a certain resort. Since April 1, 2019, Disney has sold 50,010 Bay Lake Tower points, which is about 0.9% of the resort's 5.7 million points. Some of these points will have have been sold with a different Use Year, others with the same Use Year, but the overall net gain or loss in a particular Use Year is probably negligible.