Table 1 Number of respondents (N) and response proportion (%) by survey year, gender and age
Year | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
1991 | 1999 | 2001 | 2003 | 2005 | 2007 | 2009 | 2011 | Total | ||
Boys | ||||||||||
12-14 y | N | 1559 | 1583 | 1533 | 1447 | 1420 | 1136 | 1010 | 893 | 10581 |
% | 72 | 73 | 65 | 66 | 62 | 54 | 48 | 43 | 61 | |
16-18 y | N | 1867 | 2194 | 1613 | 1561 | 1443 | 1205 | 1205 | 932 | 12020 |
% | 64 | 64 | 55 | 55 | 51 | 43 | 41 | 31 | 51 | |
Girls | ||||||||||
12-14 y | N | 1691 | 1685 | 1831 | 1626 | 1560 | 1402 | 1313 | 1073 | 12527 |
% | 83 | 83 | 77 | 77 | 73 | 70 | 66 | 57 | 73 | |
16-18 y | N | 2354 | 2608 | 2069 | 2085 | 1896 | 1874 | 1838 | 1538 | 16262 |
% | 83 | 81 | 77 | 76 | 71 | 70 | 64 | 54 | 72 | |
Total | 7471 | 8070 | 7046 | 6719 | 6319 | 5617 | 5516 | 4566 | 51044 | |
75 | 75 | 68 | 68 | 64 | 59 | 56 | 46 | 64 |