Of course, Crane bought the franchise (and a stake in the RSN) for $610m last year. Among the statistics presented by Forbes, the franchise's revenue is $196m. Let's take a look:
Val = Value (obviously)
Rev = Revenue
OpInc = Operating Income
Gate = Gate Receipts
+/- % = 1-yr Value Change
D/V = Debt/Value (Includes Stadium Debt)
Do with this what you will, but from 2006-11 the value of the franchise has increased from $442m to $549m, an increase of 24.2%.