avoid spurious downturns and 'spamming' of top-10-censorship list

top 10 list for 2016 The marked countries have a very low client count and the predicted lower value is zero. Starting from the top, Christmas Island has a median user count of one in 2016 with the third quartile being two. Also, Netherlands Antilles have a median of two connections, Kiribati, British Indian Ocean Territory, Norfolk Island, and Tokelau each a 2016 user count median of one.

Similarly, the downturns in country specific censorship events, for example Netherlands Antilles in 2016

I attached a simple patch.