| Year | 0 to 10 years | Over 10 years |
|---|---|---|
| 1970 | 30.6 | 69.4 |
| 1980 | 39.6 | 60.4 |
| 1990 | 43.8 | 56.2 |
| 2000 | 42.4 | 57.6 |
| 2010 | 34.7 | 65.3 |
| 2013 | 28.4 | 71.6 |
| 2014 | 28.1 | 71.9 |
Source: Pew Research Center tabulations of 1970-2000 decennial censuses and 2010, 2013 and 2014 American Community Surveys (IPUMS)
