| Year | Catalan only | More Catalan than Spanish | Equally Catalan and Spanish | More Spanish than Catalan | Spanish only | DK/NA |
| 2006 | 14.5% | 27.2% | 44.3% | 4.7% | 6.1% | 1.2% |
| 2010 | 20.3% | 25.5% | 42.5% | 3.9% | 5.5% | 2.3% |
| 2011 | 20.5% | 29.5% | 39.3% | 3.3% | 5.0% | 2.4% |
| 2012 | 22.7% | 30.2% | 37.3% | 3.5% | 4.0% | 2.3% |
| 2013 | 23.4% | 27.2% | 38.2% | 2.6% | 3.7% | 4.7% |
| 2014 | 24.6% | 26.0% | 38.2% | 3.5% | 4.2% | 3.4% |
| 2015 | 27.6% | 24.6% | 35.2% | 3.1% | 5.7% | 3.7% |
| 2016 | 26.3% | 24.2% | 33.8% | 5.7% | 5.1% | 5.0% |