Question about Enchanted Seasons Barbies--Autumn and Summer

Hello! I am a Barbie Collector and I'm assuming you are too--and I have a question about when the Enchanted Seasons Autumn doll and the Summer dolls were shipped out/received from Mattel. If I recall, I think the summer doll was the last one they made--is that correct? Instead of releasing them in order (winter, spring, summer, fall) they shipped the Autumn doll first. Does anyone here remember when they shipped the Summer doll? I'm asking because there is a lot of controversial information about the dates these dolls were made and so if you can recall about what month and year you received your Autumn and Summer doll, I would appreciate it! There must have been some major problems with the summer dolls for them to switch the order of them like that! Thank you for your time!