What is the most common martial art?

Martial Arts is a term that includes all methods of conducting war or going to battle. Today it has come to be used to mean the art of self defense like karate, jujitsu, taijutsu and many similar fighting methods.
actually, there are lots of martial arts all over the world.. these are the examples:

Taekwondo

Arnis

Tai Chi

Kung fu

cai lifo

karate

judo

sumo

samurai

cappoeira

kick boxing

muai thai

sumo

and many more!