The second column is the number of tags used at least as many times as the number in the first column. The percentage in the third column is the fraction that have only been used that many times.
Half of all tags have only been used once.
Ninety percent of all tags have been used fewer than twelve times.
Ninety nine percent of all tags have been used fewer than 200 times.
I've gotten down to 400 enough times to be getting a decent grasp of the top two thousand tags. Today, in a close race, ObamaCare got linked to Affordable Care Act rather than the other way round.
On Tuesday I plan to post a Tag Librarian Guide with step by step aids.
The next two thousand tags probably hold surprises.
1 345,792 47%
2 162,446 33
3 115,153 26
4 90,472 21
5 74,706 18
6 63,853 16
7 56,036 14
8 49,881 13
9 45,027 12
10 41,136 11
11 37,826 10
12 35,085 9
14 30,768 8
16 27,478 7
20 22,951 6
28 17,405 5
40 13,038 4
50 10,901 3
90 6,736 2
200 3,442 1
400 1,848 0.5