Over the past few years, it has been said that physical sales have risen significantly due to the growing popularity of K-pop throughout the world. This totally makes sense, but I wanted to visualise the growth myself, which, of course, meant creating a chart.
Thus, using figures compiled by halfdavid, I gathered Korean release sales data for the top 30 best selling Second Generation and later girl groups, and graphed each series of sales on a common chart.
The result is shown below. Note that I used different line/marker styles for each generation: 2nd = solid lines/circular markers, 3rd = dotted lines/triangular markers, 4th = dashed lines/square markers.
Observations:
• As we can see, the top selling girl groups of today (Twice, Blackpink, Iz*One) clearly outsell, on average, the top group of the Second Generation, which of course is SNSD.
• In fact, even Red Velvet, Itzy, and (G)I-dle are selling at around Girls' Generation levels (or higher) currently.
• However, there are still plenty of releases selling in the 50K to 100K range today, which has been the case over the entire duration of this chart. The difference is that these days, a mid-level group such as fromis_9 or WJSN can achieve those numbers, whereas previously, only higher tier groups such as Wonder Girls, Kara, or T-ara could.
• It is interesting to note that physical sales overall declined heading into the mid-2010s. I believe this is because Second Generation groups were losing popularity over that time period. Conversely, I see a rise in sales starting around 2015, which coincides with the advent of Third Generation girl groups.
• In addition, I have to point out that sales have increased even more dramatically starting from roughly 2019. What do we think is the cause of this? My guess is that it's largely due to increased buying levels from Chinese fans.
• Finally, keep in mind that the sales figures utilized here are total lifetime sales. If I had used, let's say, first three months data instead, the overall physical sales growth witnessed would be even greater given that lifetime sales favour earlier releases (as they've simply had more time to accumulate sales).