In the US it became available in 1995. I only know that because I was legally an adult who struggled for 4-5 years to get someone to vaccinate me.
"Chickenpox vaccine became available in the United States in 1995. Each year, more than 3.5 million cases of chickenpox, 9,000 hospitalizations, and 100 deaths are prevented by chickenpox vaccination in the United States."
Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). Learn more about what everyone should know about vaccination.
www.cdc.gov
I was vaccinated as an adult with this one. Prior to that I had no options. Every year that passed I worried more about catching it. There is no way I'd willingly let my kid catch it now. He was vaxxed in part to protect me.