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Summary of survey results by three time periods
| Mf | ICT | Og4C3 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| |
No sites |
No persons |
% pos |
No sites |
No persons |
% pos |
No sites |
No persons |
% pos |
| 1983–1992 |
50 |
6539 |
30.4 |
0 |
0 |
|
2 |
976 |
64.7 |
| 1993–2002 |
76 |
19540 |
30.1 |
35 |
8502 |
13.4 |
47 |
9755 |
56.9 |
| 2003–2011 | 29 | 6608 | 7.8 | 115 | 34762 | 12.8 | 27 | 5169 | 28.9 |
