| | 2004 | | | Rank | Provinces | % | | 1 | Buri Ram | 1.91 | | 2 | Mae Hong Son | 2.67 | | 3 | Sa Kaeo | 3.68 | | 4 | Amnat Charoen | 3.69 | | 5 | Chaiyaphum | 3.72 | | 6 | Maha Sarakham | 3.81 | | 7 | Yasothon | 4.21 | | 8 | Surin | 4.26 | | 9 | Si Sa Ket | 4.36 | | 10 | Nong Bua Lam Phu | 4.41 | | | Whole Kingdom | 10.42 |
| | | 2005 | | | Rank | Provinces | % | | 1 | Buri Ram | 2.93 | | 2 | Mae Hong Son | 2.94 | | 3 | Chaiyaphum | 3.12 | | 4 | Nong Bua Lam Phu | 3.40 | | 5 | Yasothon | 3.86 | | 6 | Kamphaeng Phet | 3.93 | | 7 | Ubon Ratchathani | 3.99 | | 8 | Loei | 4.03 | | 9 | Amnat Charoen | 4.23 | | 10 | Si Sa Ket | 4.31 | | | Whole Kingdom | 11.00 |
| | | 2006 | | | Rank | Provinces | % | | 1 | Mae Hong Son | 2.31 | | 2 | Si Sa Ket | 2.44 | | 3 | Loei | 3.41 | | 4 | Buri Ram | 3.67 | | 5 | Chaiyaphum | 4.07 | | 6 | Nan | 4.59 | | 7 | Sukhothai | 4.59 | | 8 | Nong Bua Lam Phu | 4.71 | | 9 | Nakhon Phanom | 4.86 | | 10 | Sa Kaeo | 5.09 | | | Whole Kingdom | 11.52 |
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