| Peak PRA | Year | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | |
| Total | 36,951 | 39,958 | 42,219 | 44,262 | 45,475 | 45,290 | 46,106 | 47,039 | 48,677 | 50,624 |
| 0-9% | 22,184 | 24,629 | 26,615 | 27,818 | 28,624 | 28,774 | 28,908 | 28,736 | 29,209 | 28,898 |
| 10-79% | 7,766 | 7,847 | 8,025 | 8,633 | 8,915 | 8,936 | 9,369 | 9,925 | 10,631 | 11,310 |
| 80%+ | 4,793 | 5,147 | 5,327 | 5,732 | 6,053 | 6,107 | 6,743 | 7,489 | 7,923 | 8,688 |
| Unknown | 2,208 | 2,335 | 2,252 | 2,079 | 1,883 | 1,473 | 1,086 | 889 | 914 | 1,728 |
| Total (%) | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| 0-9% | 60.0% | 61.6% | 63.0% | 62.8% | 62.9% | 63.5% | 62.7% | 61.1% | 60.0% | 57.1% |
| 10-79% | 21.0% | 19.6% | 19.0% | 19.5% | 19.6% | 19.7% | 20.3% | 21.1% | 21.8% | 22.3% |
| 80%+ | 13.0% | 12.9% | 12.6% | 13.0% | 13.3% | 13.5% | 14.6% | 15.9% | 16.3% | 17.2% |
| Unknown | 6.0% | 5.8% | 5.3% | 4.7% | 4.1% | 3.3% | 2.4% | 1.9% | 1.9% | 3.4% |