| 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | |
| Total number of children | 235 679 | 248 062 | 264 336 | 279 157 | 305 413 | 335 647 | 359 057 | 402 563 | 434 847 | 460 257 | 446 606 | 442 661 | 439 137 |
| Short-acting β-agonist alone | 3319 (1.4) | 4063 (1.6) | 4393 (1.7) | 5136 (1.8) | 5064 (1.7) | 4957 (1.5) | 4557 (1.3) | 4176 (1.0) | 3768 (0.9) | 3547 (0.8) | 3029 (0.7) | 2392 (0.5) | 1829 (0.4) |
| Inhaled corticosteroids | 6319 (2.7) | 8980 (3.6) | 12 392 (4.7) | 16 589 (5.9) | 20 100 (6.6) | 23 587 (7.0) | 25 178 (7.0) | 24 849 (6.2) | 24 402 (5.6) | 24 157 (5.2) | 22 224 (5.0) | 18 494 (4.2) | 14 426 (3.3) |
| Long-acting β-agonist and inhaled corticosteroid | 32 (0.01) | 183 (0.07) | 360 (0.14) | 548 (0.20) | 750 (0.25) | 1091 (0.33) | 1325 (0.37) | 1436 (0.36) | 1557 (0.36) | 1716 (0.37) | 1862 (0.41) | 1807 (0.41) | 1540 (0.35) |
| Leukotriene receptor antagonist and inhaled corticosteroid | 0 | 0 | 0 | 0 | 0 | 0 | 123 (0.03) | 167 (0.04) | 236 (0.05) | 374 (0.08) | 470 (0.11) | 532 (0.12) | 551 (0.13) |
Values in parentheses are percentages.