[{"_id":ObjectId("628b63d66a5951db6bb79905"),"index":0,"name":"Aurelia Gonzales","isActive":false,"registered":ISODate("2015-02-11T04:22:39.000Z"),"age":41,"gender":"female","eyeColor":"green","favoriteFruit":"banana","company":{"title":"YURTURE","email":"aureliagonzales@yurture.com","phone":"+1 (940) 501-3963","location":{"country":"USA","address":"694 Hewes Street"}},"tags":["enim","id","velit","ad","consequat"]}]

db.collection.aggregate([{$group:{_id:{$year:"$registered"},genders:{$push:"$gender"}}},{$sort:{"_id":1}},{$project:{_id:1,male:{$size:{$filter:{input:"$genders",cond:{$eq:["$$this","male"]}}}},female:{$size:{$filter:{input:"$genders",cond:{$eq:["$$this","female"]}}}},total:{$size:"$genders"}}}])