So this is something I want to collect over time but building that history will take time.
Here are some totals for End of 2019 in Japan
WiiU Japan Software:
1. Splatoon - 1.78M
2. Mario Kart 8 - 1.43M
3. New Super Mario Bros U - 1.35M
4. Super Mario Maker - 1.08M
3DS Japan Software:
1. Yo-Kai Watch 2 Bony Spirity / Fleshy Souls / Psychic Specters - 6.10M
2. Animal Crossing: New Leaf - 5.85M
3. Pokemon X / Y - 4.56M
4. Pokemon Sun / Moon - 3.94M
5. Pokemon Omega Ruby / Alpha Sapphire - 3.46M
6. Monster Hunter Generations - 3.30M
7. Mario Kart 7 - 3.08M
8. Super Smash Bros for Nintendo 3DS - 2.91M
9. New Super Mario Bros 2 - 2.76M
10. Monster Hunter 4 Ultimate - 2.70M
11. Pokemon Ultra Sun / Ultra Moon - 2.70M
12. Super Mario 3D Land - 2.30M
13. Yo-Kai Watch Busters Akanekodan / Shiroinutai - 2.29M
13. Tomodachi Life - 2.22M
14. Yo-Kai Watch 3 Sushi / Tempra / Sukuyaki - 2.17M
15. Monster Hunter XX - 1.80M
16. Animal Crossing: Happy Home Designer - 1.60M
17. Puzzle & Dragons Z - 1.50M
18. Yo-Kai Watch - 1.48M
19. Luigis Mansion 2: Dark Moon - 1.31M
20. Dragon Quest VII - 1.30M
21. Super Mario Maker for Nintendo 3DS - 1.26M
22. Monster Hunter 3 (Tri) G - 1.20M
23. Monster Strike - 1.00M
Switch Japan Software:
1. Super Smash Bros Ultimate - 4.22M
2. Pokemon Sword / Shield - 4.21M
3. Splatoon 2 - 3.78M
4. Mario Kart 8 Deluxe - 3.25M
5. Super Mario Odyssey - 2.41M
6. Pokemon Let's Go Pikachu / Eevee - 2.05M
7. The Legend of Zelda: Breath of the Wild - 1.92M
8. Super Mario Party - 1.68M
9. Super Mario Maker 2 - 1.12M