A year ago, the most popular answer was that the boom would last more than five years – in other words, through 2012. This year, the only other big group of respondents said that the boom will last four more years, to 2012. If this group of optimists is representative of the industry as a whole, perhaps the end of the boom is becoming clearer.As we gear up to our 400th issue next month, our poll asks when you started to read Cranes Today.