Need Help Calculating Website Traffic Growth Percentage for Companies

Hi Clay S., I hope you're all having a wonderful day! I'm currently facing a challenge in obtaining the percentage growth of website traffic in the last six months for a list of companies. While I can access the traffic data, I'm unsure how to get the exact percentage growth. If anyone could assist me with this, I would greatly appreciate it. I have a deadline approaching, so any help as soon as possible would be fantastic. Thank you so much in advance!