Highlight duplicate values on multiple worksheets in the same workbook

Hello,
I have a workbook that has five worksheets listing warehouse inventory items. One worksheet for 2013, 2012, 2011, 2010 and 2009. In column b of each worksheet is a column B with a heading of "Item Number". There are hundreds of item numbers on each worksheet.

I would like to be able to find and highlight item numbers that appear in multiple years. Preferably color coded showing appears in five, four and three years. If that's too difficult than just items that appear in all five years. I tried conditional formatting, but have been unsuccessful.

Lastly, is there a way to list any duplicate item numbers on a new worksheet.

Thanks so much for our help!
Eric

Thanks so much for the response. I named the ranges _2013inventory, _2012inventory, etc. I got an error message when using 2013B, 2012B, etc.
I can change the formula to reflect the range names, but I'm uncertain as to where that formula goes. I selected the range of item numbers on the 2013 tab then selected conditional formatting on the home tab. Then I selected "Highlight Cell Rules" on the drop down. There are multiple choices that come up in another drop down like "greater than" & "less than". What would I select and where would the formula go? I am not sure how to apply the CF with the formula string you gave me.

Sorry if I'm missing something obvious. I am using Excel 2011 for Mac.

Eric

Thank you very much for your help! All set!