Dept of Environment stats for all private rental accommodation inspections carried out from 2005-2019 can be viewed here
Private rental inspections annually 2005 to 2019
2005:
Inspected Dwellings 6,815
Dwellings not meeting regulatory requirements: 2,048
% Fail: 30.1%
2006:
Inspected Dwellings 8,364
Dwellings not meeting regulatory requirements: 1,697
% Fail: 20.3%
2007:
Inspected Dwellings 12,047
Dwellings not meeting regulatory requirements: 2,379
% Fail: 19.7%
2008:
Inspected Dwellings 14,880
Dwellings not meeting regulatory requirements: 2,854
% Fail: 19.2%
2009:
Inspected Dwellings 18,001
Dwellings not meeting regulatory requirements: 4,306
% Fail: 23.9%
2010:
Inspected Dwellings 18,698
Dwellings not meeting regulatory requirements: 4,706
% Fail: 25.2%
2011:
Inspected Dwellings 16,759
Dwellings not meeting regulatory requirements: 6,284
% Fail: 37.5%
2012:
Inspected Dwellings 16,055
Dwellings not meeting regulatory requirements: 7,348
% Fail: 45.8%
2013:
Inspected Dwellings 17,849
Dwellings not meeting regulatory requirements: 9,633
% Fail: 54.0%
2014:
Inspected Dwellings 14,538
Dwellings not meeting regulatory requirements: 7,550
% Fail: 51.9%
2015:
Inspected Dwellings 13,633
Dwellings not meeting regulatory requirements: 8,612
% Fail: 63.2%
2016:
Inspected Dwellings 13,392
Dwellings not meeting regulatory requirements: 10,194
% Fail: 76.1%
2017:
Inspected Dwellings 16,261
Dwellings not meeting regulatory requirements: 12,833
% Fail: 78.9%
2018:
Inspected Dwellings 25,394
Dwellings not meeting regulatory requirements: 20,388
% Fail: 80.3%
2019:
Inspected Dwellings 32,199
Dwellings not meeting regulatory requirements: 28,196
% Fail: 87.6%