Internet service providers and Republicans in Congress have been criticizing the Federal Communications Commission for a report that declares broadband service isn't being deployed quickly enough to all Americans.

In particular, ISPs and Republicans are mad that the FCC is defining "broadband" as Internet speeds of at least 25Mbps downstream and 3Mbps upstream. Using that benchmark, the FCC found that 34 million Americans, about 10 percent of the country, live in areas where they can't buy home broadband.

ISPs wanted the FCC to stick with its old standard of 4Mbps down and 1Mbps up, which the commission left behind a year ago. But even if the FCC revived that slower definition of broadband, the commission's annual reports would still find that many Americans lack access, mostly in rural areas.

The numbers are available now that the FCC's full broadband progress report has been released.

"At slower speeds, 6 percent of Americans lack access to fixed terrestrial service at 10Mbps/1Mbps and 5 percent lack access to such services at 4Mbps/1Mbps," the FCC report said.

That amounts to 19.9 million Americans who can't buy wired broadband of at least 10Mbps/1Mbps and 16.1 million Americans who can't buy wired broadband of at least 4Mbps/1Mbps. These numbers exclude satellite Internet, which suffers from worse latency than wireline services and low monthly data caps.

Congress requires the FCC to determine whether broadband is being deployed to all Americans in a reasonable and timely fashion, and to take action if the answer is negative. It's up to the FCC to decide what speeds should count as broadband.

The FCC's annual reports are always about a year behind, so the latest one is based on data from December 31, 2014. Here's what the 4Mbps/1Mbps and 10Mbps/1Mbps availability numbers look like, both including satellite and excluding satellite availability:

While the 4Mbps/1Mbps definition is no longer used in an official way, the 10Mbps/1Mbps threshold is significant because it's the minimum speed Internet providers must offer when they use government subsidies to build broadband networks in rural areas.

The FCC has found progress in deployment at its new definition of 25Mbps/3Mbps. At those speeds, the percentage of Americans who don't have broadband access dropped from 20 percent in 2012 to 10 percent in 2014.

But the percentage of Americans who can't even buy 4Mbps/1Mbps service hasn't changed as much. The 2012 broadband progress report found that 19 million Americans, or 6 percent of residents, lived in areas without 4Mbps/1Mbps access. As noted earlier, the numbers on that front have dropped to 16.1 million and 5 percent.

The new report also shows adoption rates at the different speed levels. About 58 percent of Americans who have access to 4Mbps/1Mbps speeds (excluding satellite) do buy service that's at least that fast. At the 10Mbps/1Mbps threshold, 54 percent of Americans with access are subscribers.

Adoption of 25Mbps/3Mbps service is growing quickly. In 2012, just 11 percent of Americans who could buy 25Mbps/3Mbps broadband did so. By the end of 2014, 37 percent of Americans in 25Mbps/3Mbps areas were buying speeds at at least that level:

FCC officials revised their broadband definition last year to account for families' simultaneous usage of multiple devices and applications, including high-quality video and graphics. FCC Commissioner Jessica Rosenworcel has pushed for the commission to use an even higher definition of 100Mbps, but to no avail.