| 2001–2 | 2002–3 | 2003–4 | 2004–5 | 2005–6 | |
| Any asthma medication | 4692 (8.8) | 5032 (9.6) | 5198 (10.4) | 5636 (11.7) | 5946 (14.5) |
| Only SABA | 1968 (1.8) | 2306 (1.8) | 2529 (2.2) | 2889 (3.1) | 2899 (4.9) |
| ICS + LABA (combined inhaler) | 150 (18.7) | 235 (15.3)* | 318 (15.7)* | 421 (18.8)* | 503 (22)* |
| ICS + LABA (separate inhalers) | 316 (19.9) | 258 (27) | 276 (32.9) | 279 (32.2) | 253 (33.9) |
*χ2 p<0.001. ICS, inhaled corticosteroids; LABA, long-acting beta agonists; SABA, short-acting beta agonists.