Effective with the end of yesterdays Nasdaq session, Vonages stock has been publicly traded for exactly one year.While it may be useful to discuss the steep drop in the stock price during the days and weeks immediatley following the IPO., a look at this chart provides evidence of some longer-term trend.Id call that trend regressive plateau-ing.Take a quick peek at the chart and then let me know if you agree with what I am seeing. What seems to be occuring is that per share, Vonage stock seems to decline to a certain level, hold that level for a couple of months,and then over a period of a few days or a week at most, land at a lower...