More Americans identify as Democrats than Republicans by a margin that hasn't been seen in a decade, according to a report released by Gallup on Wednesday.

An average of 49% of adults age 18 and older reported Democratic Party affiliation or said they are independent with Democratic leanings throughout the first quarter of 2021, the pollster reported. The survey was conducted by phone from January-March.

In comparison, 40% of adults identified as Republican or Republican-leaning. The 9% difference is the Democrats' largest advantage since the fourth quarter of 2012, according to the report.

The remaining 11% of respondents were political independents with no partisan leanings.

Democrats have typically held a 4 to 6 point advantage over Republicans. Shortly before the first quarter of the year, the gap in affiliation was virtually nonexistent before Democrats' advantage widened by 9%.