Problem with Bulkifying code

Developer Beginner > Apex Triggers >Bulk Apex Triggers

Currently stuck on this problem. 

Here are the instructions: 

• Create an Apex trigger:
  • Name: ClosedOpportunityTrigger
  • Object: Opportunity
  • Events: after insert and after update
  • Condition: Stage is Closed Won
  • Operation: Create a task:
    • Subject: Follow Up Test Task
    • WhatId = the opportunity ID (associates the task with the opportunity)
  • Bulkify the trigger so that it can insert or update 200 or more opportunities

Here is my code: 

trigger ClosedOpportunityTrigger on Opportunity (after insert, after update) {     List <Task> TaskList = new List<Task>();          for (Opportunity a : Trigger.New) {         if(a.StageName == 'Closed Won'){         TaskList.add(new Task(Subject= 'Follow Up Test Task',                                WhatId = a.id));         }     }          if(TaskList.size() > 0) {  insert TaskList;     } }

This is the error:

'We tried to insert 200 opportunities but the trigger exceeded DML limits. Make sure your code is bulkified.'