<prompt> Translate the following text to EnglishUchunguzi wa Reston, VA, kwa zaidi ya miradi 2,000 kutoka viwanda mbalimbali, unaonyesha kupungua kwa asilimia ya miradi mikubwa iliyoundwa na wafanyikazi wa ndani ya wamiliki kutoka asilimia 30 wakati wa 1970 hadi 1975 hadi asilimia 25 wakati wa 1981 hadi 1985, hadi chini ya asilimia 10 baada ya 1991.  <response>: Analysis IPA of Reston, VA, for more than 2,000 projects from a variety of industries, show a decline in the percentage of major projects designed by owners inhouse staff from about 30 percent during 19701975 to about 25 percent during 19811985, to less than 10 percent after 1991. 