About 6 billion
How many BILLIONS of individual creatures are there?
A lot
How many changes, per year, would have to happen for this to occur by ET?
Changes happen in a parallel fashion, not a serial one. Organisms do not have to wait in line behind other organisms to evolve.
Again, could you state what point you're trying to make?
Tell this to your OTHER "E" guy's that claim Evolution is a 'series' of small changes adding together.