Period,"All CO deaths, annual avg","Heating systems, annual avg",Heating share of all %,"Generators, annual avg",Generator share of all %,"Furnaces incl. boilers, annual avg",Furnaces share of heating %,Installed furnaces+wall/floor share of heating %,"Portable heaters, annual avg",Portable heaters share of heating %,Wall/floor furnaces share of heating %,Room/space and unspecified heaters share of heating % 1999-2002,137.0,74.0,54.0,22.0,16.1,33.0,44.6,60.8,19.8,26.7,16.2,12.5 2003-2006,172.8,63.0,36.5,65.8,38.1,29.0,46.0,51.6,20.5,32.5,5.6,15.9 2007-2010,167.8,55.8,33.2,62.5,37.3,26.0,46.6,57.0,14.2,25.6,10.3,17.5 2011-2014,152.5,50.5,33.1,57.8,37.9,23.5,46.5,50.0,13.5,26.7,3.5,23.3 2015-2018,186.8,47.8,25.6,82.2,44.0,24.5,51.3,53.9,16.2,34.0,2.6,12.1 2019-2022,241.8,69.5,28.7,99.0,41.0,22.8,32.7,36.7,29.5,42.4,4.0,20.9