The retail value of those albums is unclear, since SoundScan measures only units sold.
All told, Underwood has sold 9.6 million albums and 10.7 million digital downloads, according to Nielsen Soundscan.
Compact disc sales fell 3% last year, and are down 8% so far this year, according to SoundScan.
According to Nielsen SoundScan, West to date has sold more than 957, 000 albums.
As measured by Nielsen SoundScan, overall music sales reached an another all-time high, with unit sales increasing 3.1% over last year.
FORBES: Whitney Houston, EDM, Vinyl: Inside The Music Stats of 2012
In 2010, 2.8 million LPs were sold, up 14% from 2009--and more than any other year since Nielsen SoundScan began tracking sales in 1991.
This is the first time in SoundScan's 21-year history that the same record has been the top seller in the first halves of any two years.
If "21" continues to fly off the shelves at this rate, it could be the first record in the SoundScan era to top the year-end charts twice.
In 2012, the compact disc continued its long decline, with sales down 13% from last year, and down 70% from 10 years before, according to Nielsen SoundScan.
As for Gotye's ubiquitous "Somebody That I Used to Know, " that track has a digital sales figure of 5.50 million for the year to date, according to SoundScan.
Nielson SoundScan estimates that 38, 000 new albums were released in 2003, a figure that swelled to 106, 000 by 2008, then fell during the recession to 75, 000 in 2010.
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Over the last five Super Bowls, these acts have seen an average boost in album sales of 187% in the week following the game, according to Nielsen SoundScan.
In 2009, 39 years after breaking up, they sold the third-highest number of albums of any act in the U.S., according to Nielsen SoundScan, with 3.3 million copies sold.
"The Beatles Anthology" DVD, released in April, debuted at No. 1 on Billboard's music video chart and marked the biggest music video DVD box set debut in the SoundScan era.
"21" has continued its amazing run a year after its initial release, selling 3.69 million copies through the sales week that ended July 1, the mid-year point for tracker Nielsen SoundScan.
"21's" midway-point sales figures also mark another first in the SoundScan era -- it's the first time just one album has sold over a millioncopies in the year's first six months.
To see how well this genre (as well as a few others) performed, we turned to Nielsen SoundScan, which tracks album sales in the digital, CD and, in some cases, tape and LP format.
According to the New York Times and Nielsen Soundscan, weekly record sales can jump between 40 and 60 percent in the weeks following a Rock and Roll Hall of Fame nod.
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Yet vinyl continued its improbable rise (which I wrote about more extensively last year) as LP sales soared 17.7% to 4.6 million, setting a new SoundScan Era record for the fifth consecutive year.
FORBES: Whitney Houston, EDM, Vinyl: Inside The Music Stats of 2012
Music sales this year are down again, burnt by file sharing and CD burning, among other reasons: So far this year music buyers have bought 423 million units, down 5.2% from a year ago, according to Nielsen SoundScan.
Recorded-music sales in the U.S. edged up for the first time since 2004, according to Nielsen SoundScan, thanks to lower prices, growing digital song sales and a massive hit from the singer Adele, whose album "21" sold more copies than any title in the last seven years.
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