Once upon a time, Salesforce (CRM 3.50%) was the poster child for growth. The company pioneered cloud-based customer relationship management (CRM) systems. However, Salesforce's share price has declined over the last five years, a period in which the S&P 500 (^GSPC 1.67%) soared nearly 70%. The significant gap between Salesforce's performance and the S&P 500 widened amid the widespread sell-off of SaaS stocks this year.But is now the time to buy Salesforce stock? Here's what the numbers reveal.NYSE : CRMSal ...