Region: Red River Delta
First 4 months of 2015: 1,707
First 4 months of 2016: 2,822
Region: Northern Midlands and Moutainous
First 4 months of 2015: 421
First 4 months of 2016: 534
Region: Central Coast
First 4 months of 2015: 1,082
First 4 months of 2016: 1,589
Region: Central Highlands
First 4 months of 2015: 242
First 4 months of 2016: 394
Region: Southeast
First 4 months of 2015: 2,239
First 4 months of 2016: 4,523
Region: Mekong Delta
First 4 months of 2015: 625
First 4 months of 2016: 1,469