2012 Infographics from GAON
DAs for some popular songs. Notice the similar trend. Also notice that songs with only a few days their first week usually have a higher 2nd week after which it follows the same trend.
This chart has more songs note the anomaly in Twinkle's 5th week and 2 significant points of boosts, lasting a few weeks each, for Gangnam Style likely due to overseas exposure and news coverage.
Gender and ages of fans of various songs. T-ara and Wondergirls gettin' that males in their 50s demographic!
This graphs shows percentage of monthly #1's per company so who had the #1 song by DAs monthly out of the 12 months of 2012. YG Entertainment seems to be the only company with more than 1, taking in a total of 5.
Here is a breakdown:
January: T-ara (CCM)
#2 by approx. 30 million DAs: Dynamic Duo (Amoeba Culture)
February: BIGBANG (YG)
#2 by approx. 13 million DAs: Lyn (Good)
#2 by approx. 4.5 million DAs: 2AM (JYP)
April: Busker Busker (Indie)
#2 by approx. 35 million DAs: Sistar (Starship)
May: SNSD-TTS (SM)
#2 by approx. 100,000 DAs: IU (LOEN)
June: Wondergirls (JYP)
#2 by approx. 500,000 (half a million) DAs: BIGBANG (YG)
July: 2NE1 (YG)
#2 by approx. 14 million DAs T-ara (CCM)
August: Psy (YG)
#2 by approx. 53 million DAs: Boa (SM)
September: Seo In Guk & Jung Eunji (Jellyfish & CUBE)
#2 by approx. 1 million DAs: G-Dragon (YG)
October: Gain (LOEN)
#2 by approx. 2 millions DAs: Epik High (YG)
November: Lee Hi (YG)
#2 by approx. 19 million DAs: Geeks (LOEN)
December: Lee Seung Gi (Hook)
#2 by approx. 23 million DAs: Yang Yeoseob (Cube)
Three months YG artists were #2 by fewer than 3 million DAs. Other than YG artists as well as 2AM and IU's #2 rankings all other #2 ranking songs were over 10 million DAs away from the #1 ranking song. Otherwise if we were to use a points system with a #1 song getting 3 points, a #2 song getting 2 points and a #3 song getting 1 points. It would look something like this:
Ameoba Culture: 2
There is certainly a trend here but it is important to note that this is impacted by when in the month songs were released. Sistar for example has 2 songs in the Top 10 yearly (or it is almost certain they do but technically yearly GAON charts have not been released) despite never topping a monthly chart.