A 6% increase is significant. 

From the 2011 census in southern Ireland:

"Church of Ireland - There were 129,039 members of the Church of Ireland in April 2011, an increase of 6.4 per cent on 2006. This included 13,667 primary school aged children and 8,809 of secondary school age. One in ten Church of Ireland workers had occupations in agriculture and related activities."

http://www.cso.ie/en/newsandevents/pressreleases/2012pressreleases/pressreleasecensus2011profile7religionethnicityandirishtravellers/