How many reindeer pull Santa's sleigh

How many reindeer pull Santa's sleigh
There are 9 reindeer.
There names are Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donner, Blitzen and Rudolph


they help to pull the sleigh and help Santa claus deliver Christmas gifts.
there used to be 8 reindeer ,The subsequent popularity of the Christmas song "Rudolph the Red-Nosed Reindeer" has led to another reindeer name joining in.so there are now 9 reindeer now, Santa will be glad to have one more friend.