Without recasting, would you include hyphens in any of the examples below? I think they're clear, as is, without them. If you would use hyphens, where would you put them? I know there are rules governing the use of hyphens in compound modifiers, but I think that because clarity is not compromised we can avoid hyphens in these four examples. The intended meaning is certainly clear without them; do you concur with all four as they stand below?
a $100 million to $150 million a year industry
an $11 a barrel price
a 10 to 20 percent a year increase
a 20% to 25% a year increase