| 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% |
| 2015 | 27.9% | 72.1% |
| 2016 | 27.6% | 72.4% |
| 2017 | 27.8% | 72.2% |
- Report
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Numbers, Facts and Trends Shaping Your World
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