| | | 2009 | | Rank | Provinces | Proportion | | 1 | Si Sa Ket | 14.58 | | 2 | Phichit | 13.53 | | 3 | Narathiwat | 13.33 | | 4 | Chaiyaphum | 12.69 | | 5 | Kalasin | 12.00 | | 6 | Nong Khai | 11.92 | | 7 | Pattani | 11.81 | | 8 | Supan Buri | 11.70 | | 9 | Trat | 10.21 | | 10 | Nakhon Nayok | 10.11 | | | Whole Kingdom | 20.12 |
| | | | 2010 | | Rank | Provinces | Proportion | | 1 | Chumphon | 15.94 | | 2 | Ubon Ratchathani | 15.86 | | 3 | Kalasin | 15.80 | | 4 | Narathiwat | 15.68 | | 5 | Uthai Thani | 14.99 | | 6 | Supan Buri | 14.12 | | 7 | Nakhon Nayok | 14.09 | | 8 | Chaiyaphum | 13.42 | | 9 | Nong Khai | 12.94 | | 10 | Pattani | 12.74 | | | Whole Kingdom | 22.37 |
| | | | 2011 | | Rank | Provinces | Proportion | | 1 | Surat Thani | 17.31 | | 2 | Supan Buri | 17.29 | | 3 | Mae Hong Son | 17.04 | | 4 | Uthai Thani | 16.52 | | 5 | Chumphon | 16.01 | | 6 | Nakhon Nayok | 15.94 | | 7 | Narathiwat | 15.94 | | 8 | Nong Khai | 15.27 | | 9 | Chaiyaphum | 15.26 | | 10 | Pattani | 15.19 | | | Whole Kingdom | 23.67 |
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