Log entries GCC Nature Trail Letterbox 5x 0x 5x 1x Gallery
2016-11-14 16:24 Mr.Yuck (229) - Note
Sorry Bon Echo, didn't mean to tick you off. On a serious decline, maybe? Geocaching has been on the decline since 2012 I believe, just not as pronounced.
Google Trends for Letterboxing
Traditional Plants on AQ (the bar graph by year about halfway down the page is telling).