68
86
81
65
103
342
107
122
400
275
332
600
299
360
660
239
261
551
212
345
246
306
228
279
228
252
85
190
48
127
Jan.
Feb.
March
April
May
June
July
Aug.
Sept.
Oct.
Nov.
Dec.
* A site is a location with at least one structure, and this number includes locations that have had structures set up on more than one occasion.