I am a music historian, and with @AdrianRMG I have researched the best-selling single of every decade all the way back to 14,000BC. Here's a thread:
2010s - Ed Sheeran, The Shape of You
i’m a huge pervert abt this, so i need to note. the one pictured here is actually the bestway inflatable orca, not the intex orca. note the distinct white handles and lack of cartoon eyes (left: intex, right: bestway)
like yeah i'd recognize the intex orca anywhere, classic starter for pooltoy furries and well-recognized in those circles to this very day. absolutely iconic.
i know this because i had one (and technically still do but its at the bottom of a box in my shed right now).