Copy and pasted from my VMCAS app from last year:
"Personal Statement (MANDATORY)
Your personal statement should be written clearly and succinctly - 5000 characters (including spaces) have been allotted for your statement.
Discuss briefly the development of your interest in veterinary medicine. Discuss those activities and unique experiences that have contributed to your preparation for a professional program. Discuss your understanding of the veterinary medical profession, and discuss your career goals and objectives. "
I don't think it changes from year to year.