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| Maternal age, yr | 1995, % | 2000, % | 2005, % | 2010, % | 2015, % |
|---|---|---|---|---|---|
| < 15 | 0 | 0 | 0 | 2.9 | 12.5 |
| 15–19 | 4.2 | 5.3 | 3.9 | 6.2 | 7.8 |
| 20–24 | 2.9 | 3.5 | 3.9 | 4.8 | 5.1 |
| 25–29 | 2.7 | 3.4 | 3.8 | 4.3 | 4.6 |
| 30–34 | 3.3 | 4.1 | 4.3 | 4.9 | 5.6 |
| 35–39 | 4.9 | 5.7 | 6.0 | 6.4 | 7.0 |
| 40–44 | 6.6 | 7.3 | 7.0 | 7.3 | 7.7 |
| 45–49 | 3.7 | 6.9 | 8.8 | 9.8 | 13.4 |
| ≥ 50 | 0 | 13.0 | 11.5 | 9.7 | 7.1 |
| Unknown | 4.1 | 1.2 | 4.8 | 5.3 | 3.0 |
| ≥ 35 (advanced age) | 4.8 | 6.7 | 10.6 | 17.0 | 23.9 |
| Total | 3.0 | 3.9 | 4.1 | 5.0 | 5.7 |
LBWIs = low birth weight infants.
