These statistics are really a great addition to Wikimedia Statistiks. It seems to me that the declines in February and August in most of the Wikipedia language editions relate to holidays?
It is amazing how many views the vo.WP shows. My theory is that the views for a Wikipedia partly are not views from people how actually speak the language. I suppose that a lot of Volapük views come from e.g. English speaking people who see the en.WP article about their home town in the US and then check the articles in other language editions.
Fy.WP has much better developped than co.WP, with ten times of the "real articles", but it has only three times as many views. But fy.WP has only few geographical stubs and similar pseudoarticles, compared to co.WP. In co.WP, only ten % are real articles, the rest are Spanish or Italian cities (and similar pseudo articles).