<prompt> Translate the following text to EnglishKwa sababu ya kuongezeka kwa mahitaji ya watengenezaji wa boilers katika miaka ya hivi karibuni, idadi ya wanachama wa boilermakers imeongezeka kutoka 15,444 katika 1998 hadi 17,587 katika 2000, kiwango cha ukuaji wa kila mwaka wa 6.7.  <response>: Also, in response to the increase in demand for boilermakers over the last few years, their ranks have increased from 15,444 active members in 1998 to 17,587 members in 2000 - an annualized growth rate of 6.7 percent. 