| Peak PRA | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | |
| Total | 34,496 | 36,948 | 39,956 | 42,219 | 44,263 | 45,479 | 45,294 | 46,120 | 47,060 | 48,773 |
| 0-9% | 20,489 | 22,182 | 24,627 | 26,612 | 27,814 | 28,618 | 28,747 | 28,866 | 28,657 | 29,000 |
| 10-79% | 7,392 | 7,766 | 7,847 | 8,025 | 8,630 | 8,914 | 8,928 | 9,354 | 9,905 | 10,578 |
| 80%+ | 4,447 | 4,793 | 5,147 | 5,327 | 5,733 | 6,054 | 6,106 | 6,744 | 7,486 | 7,908 |
| Unknown | 2,168 | 2,207 | 2,335 | 2,255 | 2,086 | 1,893 | 1,513 | 1,156 | 1,012 | 1,287 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| 0-9% | 59.4% | 60.0% | 61.6% | 63.0% | 62.8% | 62.9% | 63.5% | 62.6% | 60.9% | 59.5% |
| 10-79% | 21.4% | 21.0% | 19.6% | 19.0% | 19.5% | 19.6% | 19.7% | 20.3% | 21.0% | 21.7% |
| 80%+ | 12.9% | 13.0% | 12.9% | 12.6% | 13.0% | 13.3% | 13.5% | 14.6% | 15.9% | 16.2% |
| Unknown | 6.3% | 6.0% | 5.8% | 5.3% | 4.7% | 4.2% | 3.3% | 2.5% | 2.2% | 2.6% |