Subscript Macro: Go Cell By Cell And Format The Last Number

Is it possible to make a macro that will go cell by cell and format the last number of the cell as subscript? Here's an example:

Brooks #1H 5Stewart #8H, #9H 8Stevenson D Unit #1H 2150,000 BblsStewart #8H, #9H 8Stevenson D Unit #1H 2Brooks #1H 5Stewart #8H, #9H 8Holasek #1H 5Brooks #1H 5Stewart #6H, #7H 8140,000 BblsRayburn Unit #5H, #6H, #12H 6160,000 BblsHolasek #1H 5450,000 BblsStewart #6H, #7H 8#N/ARayburn Unit #5H, #6H, #12H 6Stewart #6H, #7H 8Holasek #1H 5Rayburn Unit #5H, #6H, #12H 6Stewart #6H, #7H 8Holasek #1H 5

I would like ONLY the last NUMBER of the cell to be formatted as subscript. The cells with "Bbls" would be left as is.