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| Year | Roof coverage | % change |
| 2008 | 145.2 | +4% |
| 2009 | 152.7 | +5% |
| 2010 | 157.3 | +3% |
| 2011 | 162.1 | +3% |
| 2012 | 168.3 | +4% |
| Pitched roofing | |
| Concrete tiles | 23.8 |
| Slate | 12.7 |
| Clay tiles | 4.5 |
| Total | 41.1 |
| Flat roofing | |
| Felt | 22.6 |
| Single-ply PVCu | 3.9 |
| Asphalt | 2.1 |
| Total | 28.6 |
| Metal roofing | |
| Steel | 62.8 |
| Aluminium | 6.6 |
| Total | 69.4 |
| GRAND TOTAL | 139.1 |
| Single-ply membrane | 95-112 |
| Natural slate | 150 -190 |
| Aluminium standing-seam | 90 -120 |
| Two-coat asphalt | 150 -190 |
| High-performance bitumen felt | 100 -120 |
| Stainless steel standing seam | 120 -160 |
| Clay tiles | 65 - 90 |