With Visa (V) breaking the record for the largest US IPO ever today, we put together a chart of the monthly number of IPOs since 1990 for those interested. As shown below, the current decade has paled in comparison to the 1990s when it was common for 50 or 60 companies to go public in a month. The tech bubble hangover of the early 2000s was very weak for IPOs, but things picked up again once the bull market that started in late 2002 was finally given credence. Things didn't really begin to slow again until the last few months. After 43 IPOs in November 2007 (a month that saw big declines in equity markets), December saw 22, January saw 15 and February saw 8, which was the slowest month since May 2003. We've only gotten 4 this month so far, including the Visa IPO.