Year the owner acquired the business,Years of ownership by 2023,Building equipment contractors (%),Building equipment owners (count),All industries (%) Before 1980,44 or more,2.6,4024,2.1 1980 to 1989,34 to 43,7.5,11574,5.3 1990 to 1999,24 to 33,12.1,18722,10.6 2000 to 2009,14 to 23,21.2,32737,19.2 2010 to 2019,4 to 13,29.4,45505,33.7 2020,3,3.4,5299,4.3 2021,2,4.5,7023,4.9 2022,1,3.5,5385,4.3 2023,under 1,2.1,3262,1.3 Don't know,unknown,13.7,21167,14.4 Before 2000 (calculated),24 or more,22.2,34320,17.9 2020 to 2023 (calculated),3 or fewer,13.6,20969,14.8