Here is the list of top 10 December 2016 games.

1.		My Racing Career Motorsport manager	10.20%
2.		Red Zone Action Football manager	9.51%
3.		Soccer-Manager.Org Soccer manager	5.03%
4.		Dugout Soccer Soccer manager	3.38%
5.		MMA Tycoon Boxing manager	3.13%
6.		Rocking Soccer Soccer manager	1.93%
7.		Basketball Zone Basketball manager	1.89%
8.		VolleySquare Volleyball manager	1.82%
9.		WebSimHockey Hockey manager	1.74%
10.		Grand Prix Racing Online Motorsport manager	1.72%

And here are the popularity ratings of major sports:

soccer - 23.79%

motorsport - 17.77%

football - 12.48%

basketball - 9.16%

boxing - 6.38%

hockey - 5.46%

cycling - 4.85%

baseball - 4.08%

horseracing - 3.67%

rugby - 2.41%

volleyball - 2.36%

tennis - 1.84%

cricket - 1.82%

handball - 1.62%