Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name/ designation | Year of intro | Country of origin | Primary cartridge | Major users |
| --- | --- | --- | --- | --- |
| CSMG | 2000.0 | Belgium | 9x19mm Parabellum 22mm Grenade | n/a |
| Flieger-Doppelpistole 1919 | 1919.0 | Switzerland | 7.65x21mm Parabellum | n/a |
| Gordon Close-Support Weapon System | 1972.0 | Australia | 9x19mm Parabellum | n/a |
| ITM Model 4 | 1990.0 | United States | 9x19mm Parabellum | n/a |
| Neal submachine gun | 1948.0 | United States | .22LR | n/a |
| Onorati SMG | 1935.0 | Italy | 9x19mm Parabellum | n/a |
| Saturn machine pistol | 1985.0 | Colombia | .22LR | n/a |
| SerLea | 1990.0 | Lebanon | 9x19mm Parabellum | n/a |
Question:
How many years of introduction does the Neal Submachine Gun have?
Answer:
1.0