$users = DB::table('serins')
    ->join('nomina_user', 'nomina_user.id', 'serins.nominau_id')
    ->where('nomina_user.user_id', Auth::id())
    ->selectRaw('COUNT(*) as count')
    ->whereYear('fecha', date('Y'))
    ->groupBy(DB::raw("MONTH(fecha)"))
    ->pluck('count');