[Sunred]

As a point of reference, here are the annual domestic sales starting with Go-Busters. The additional info are from the respective show's Japanese wikipedia page that has citations to sales and interviews, etc.

Go-Busters: 9.6 billion yen. Despite Go-Buster Ace and the buster machines getting awards and stuff, PLEX's Sojiro Tanaka has gone on to record to say that they regret not coming up with a solid alternative to collectables for the show, which Gokaiger had, and that is why they decided to sell zyudenchis for Kyoryuger the following year.

Kyoryuger: 14.4 billion yen. It exceeded BOTH GOKAIGER AND GO-BUSTERS. Roleplay toy sales in terms of units were three times higher than the previous year, four times higher in terms of sales amount. 200K units of Kyoryujin were sold by summer 2013. Kyoryujin was the highest-selling sentai robot in a decade.

ToQger: 11.3 billion yen.

Ninninger: 7.8 billion yen.

Zyuohger: 8.8 billion yen.

Kyuranger: 9.1 billion yen.


After the second major drought that was Ninninger, Super Sentai has been on a gradual rise as of Zyuohger. They hope to reach 10.5 billion yen for Lupinranger VS Patranger it seems.

While we are at it, here are the Top 10 Bandai domestic toy sales for 2017.
1. Gundam. 26.2 billion yen.
2. Kamen Rider. 24.8 billion yen.
3. Dragon Ball. 14.2 billion yen.
4. Anpanman. 10.9 billion yen.
5. Super Sentai. 9.1 billion yen.
6. Pretty Cure. 8.1 billion yen.
7. One Piece. 4.6 billion yen.
8. Ultraman. 4.3 billion yen.
9. Pokemon. 4 billion yen.
10. Aikatsu. 2.3 billion yen.

Overall sales rankings are different.
1. Dragon Ball. 97.9 billion yen.
2. Gundam. 68.3 billion yen.
3. One Piece. 29.4 billion yen.
4. Kamen Rider. 26.4 billion yen.
5. Super Sentai. 19.4 billion yen.
6. NARUTO. 11.3 billion yen.
7. Anpanman. 10.9 billion yen.
8. Pretty Cure. 8.1 billion yen.
9. Ultraman. 6 billion yen.
10. Aikatsu. 3.6 billion yen.