Below are figures from Mexico (a country with one of the highest numbers of JW's) that show a rather dramatic decline in growth of average publishers, which peaked at 4% (2009 and 2010). In just six years fell to only 1.36 %. It's not just developed countries that see the BS of the Watchtower.
YEAR BOOK 2017 2016 2015 2014 2013 2012 2011 2010
AVG PUB 829793 818481 802903 777429 749585 724690 696749 668876
GROWTH 1.36% 1.90% 3.17% 3.58 % 3.32% 3.86% 4.00% 4.04%