| | 2009 | Rank | Provinces | Proportion | 1 | Bangkok | 37.95 | 2 | Nonthaburi | 34.75 | 3 | Phuket | 28.44 | 4 | Nan | 26.54 | 5 | Chiang Mai | 25.35 | 6 | Khon Kaen | 23.53 | 7 | Pathum Thani | 23.51 | 8 | Lampang | 23.39 | 9 | Phrae | 23.24 | 10 | Songkhla | 23.16 | | Whole Kingdom | 20.12 |
| | | 2010 | Rank | Provinces | Proportion | 1 | Bangkok | 39.64 | 2 | Nonthaburi | 35.14 | 3 | Phuket | 30.14 | 4 | Nan | 28.48 | 5 | Chiang Mai | 27.98 | 6 | Pathum Thani | 26.81 | 7 | Nakhon Pathom | 25.61 | 8 | Chon Buri | 25.55 | 9 | Songkhla | 25.14 | 10 | Samut Prakan | 24.97 | | Whole Kingdom | 22.37 |
| | | 2011 | Rank | Provinces | Proportion | 1 | Bangkok | 40.62 | 2 | Nonthaburi | 35.31 | 3 | Phuket | 31.91 | 4 | Chiang Mai | 30.48 | 5 | Nan | 28.78 | 6 | Pathum Thani | 27.39 | 7 | Samut Prakan | 27.37 | 8 | Songkhla | 26.66 | 9 | Nakhon Pathom | 25.86 | 10 | Phayao | 25.70 | | Whole Kingdom | 23.67 |
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