How to Spawn one object at a time in Transform Array

Hi Everyone,

This is my first question so I apologise if I miss something off.

numOfEnemies = population / 100000;

int enemySpawnIndex = Random.Range(0, enemySpawn.Length);

     for (int i = 0; i < numOfEnemies; i ++)
     {
             Instantiate (enemy, enemySpawn[enemySpawnIndex].position, enemySpawn[enemySpawnIndex].rotation);
             totalNumOfEnemies++;
     }

Above code creates Min Enemies 1 and Max 9, but my problem is when I have more than 1 Enemy, it spawns them in the same spawn location as opposed to spawning one enemy in each slot in my Transform array. I'm kind of new to programming and I can't figure out how to set it so if 9 enemies spawn, they each have a different position.

Any help would be appreciated, thank you!