Fastest-Growing City in Seattle Area?

Not Seattle, which grew at just a .7% rate between 2020 and 2021.  Bellevue only grew at .5%; adding only 750 new residents.  Not Arlington, which grew at 4.1% or Edgewood, which grew at 6.4%; but Black Diamond! Black Diamond grew at a rate of 13% for the same timeframe.  This is due, in great part, to the new community of Ten Trails; which has been under construction since 2018 and is expected to eventually bring 15,000 people to the city.