Let's be precise: YOU were talking about your "revelation" that the grass changed in 2001, and not 2002.
Others in this thread were talking about earlier periods, and without additional clarification, it wasn't clear exactly which argument you were addressing, so your objection was rightfully rejected.
Now, you put additional conditions, and I have responded to them, to which you didn't respond adequately. Telling me how many times clay court players missed Wimbledon doesn't address my answer to your argument. In fact, you don't stay with your previous argument.
Do you remember what it was?