| | 2008 | Rank | Provinces | Proportion | 1 | Nonthaburi | 44.15 | 2 | Bangkok | 43.78 | 3 | Songkhla | 36.44 | 4 | Pathum Thani | 35.89 | 5 | Samut Prakan | 34.17 | 6 | Phuket | 34.06 | 7 | Chiang Mai | 33.77 | 8 | Phatthalung | 30.90 | 9 | Nan | 30.36 | 10 | Trang | 29.86 | | Whole Kingdom | 28.17 |
| | | 2009 | Rank | Provinces | Proportion | 1 | Nonthaburi | 45.84 | 2 | Bangkok | 45.75 | 3 | Phuket | 39.39 | 4 | Pathum Thani | 37.37 | 5 | Nan | 35.94 | 6 | Chon Buri | 35.64 | 7 | Samut Prakan | 35.48 | 8 | Chiang Mai | 32.68 | 9 | Trang | 32.10 | 10 | Lampang | 32.06 | | Whole Kingdom | 29.24 |
| | | 2010 | Rank | Provinces | Proportion | 1 | Bangkok | 47.35 | 2 | Nonthaburi | 46.35 | 3 | Phuket | 40.60 | 4 | Pathum Thani | 37.62 | 5 | Samut Prakan | 36.52 | 6 | Chon Buri | 36.27 | 7 | Nan | 36.13 | 8 | Chiang Mai | 35.44 | 9 | Rayong | 34.20 | 10 | Nakhon Pathom | 34.10 | | Whole Kingdom | 30.92 |
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