Vinyl sales in the US have risen nearly fivefold in the last 5 years

"The latest, sourced from RIAA retail revenue data obtained this week, shows a near-fivefold revenue increase in vinyl over a five-year period.  Which, when scaled to size, looks something like this...
Specifically, 2010 receipts - after returns - were $87.0 million, compared to $15.7 million in 2006.   And, keep in mind, this also counts indie-focused distributors, owned by major label groups.  Which makes sense, because indies are driving a lot of this action.  Here's the breakdown, in both units and revenues (in millions, all net post-returns):
2006: 0.9 million units; $15.7 million revenue
2007: 1.3 million units; $22.9 million
2008: 2.9 million units; $56.7 million
2009: 3.2 million units; $60.2 million
2010: 4.0 million units; $87.2 million"
Source:  Data from the RIAA, reported by Digital Music News, 3rd June 2011
Note - Digital Music News have a great graphic on their site