;1996;2006;2016; Works so hard that you breathe heavily most of the time;..;7;7; Must squat or kneel down most of the time;10;8;7; Standing up or walking most of the time;57;54;.; Must lift in uncomfortable positions most of the time;9;7;5; Works standing up, most of the time;..;..;44; Works sitting down, most of the time;..;..;59; Works with arms lifted most of the time;10;8;6; Works bent forward without resting on hands or arms most of the time;10;4;5; Works with head bent forward most of the time;..;..;10; Works in other positions that place a permanent strain on the back;13;..;.; Works with repeated or monotonous movements most of the time;35;38;35; Works sitting down, 2 hours or more without possibility to stand up and stretch ones legs;10;3;.; Lifts at least 20 kg at least 5 times a day;17;13;10; Works with keyboard or mouse;..;..;72; Works in front of computer monitor;..;..;77; ;;;; Number of employed respondents;..;..;7765; Number of respondents in work;2135;9961;8220;