# Net migration index
- **The net migration index** represents the total net migration during a given period, calculated as the number of **immigrants** minus the number of **emigrants**, and includes both **nationals** and **non-nationals**.
- **Migration** tends to increase in countries experiencing **economic and political crises**, **conflicts**, and **wars**.
- During the first four years of the **Syrian crisis**, migration rates were exceptionally high due to the war and economic instability in Syria, with migration peaking in **2013**, two years after the start of the crisis.
- However, between **2018 and 2023**, **immigrant rates** began to rise, indicating that **deportations** from some **neighboring countries** contributed to these rates.