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:
| Type | Manufacturer | Numbers | Year built | Quantity built | Power (horsepower) | Max Speed (km/h) | Note |
| --- | --- | --- | --- | --- | --- | --- | --- |
| RHN | Hitachi | 1011-1048 (power cars)\n11-48\n(trailer cars) | 1967 | 38+38 | 220 | 90 | Now use as a Northeastern line commuter train. |
| RTS | Tokyu | D9-D16\n(power cars)\nTS4-TS7\n(center/trailer cars) | 1971 | 8+4 | 220 | 70 | Ex-Mahachai railways, to be refurbished. Similar bodyshell of THN and NKF but with different formation (power car-2 trailer cars). |
| THN | Tokyu, Hitachi and Nippon Sharyo | 1101–1140 | 1983 | 40 | 235 | 105 | Similar to NKF. |
| NKF | Nippon Sharyo, Hitachi, Fuji Heavy Industries,Kawasaki Heavy Industries, Niigata Tekkousho, and Kinki Sharyo | 1201–1264, (center) 2101-2112 | 1985 | 64+12 | 235 | 105 | Similar to THN, but with plastic chairs. |
| ASR\n(Class 158 Express Sprinter) | BREL, Derby Works | 2501–2512, (center) 2113-2120 | 1991 | 12+8 | 285 | 120 | Metre gauge version of British Rail Class 158, with different gangways and couplers, and with inward-opening slam doors instead of plug doors. 3-car set until 2011, when all were refurbished with new seats, vinyl floors, an extra coach and new livery. |
| APD .20 | Daewoo Heavy Industries | 2513-2524 (center) 2121-2128 | 1995 | 10+8 | 298 | 120 | First batch, narrow body. |
| APD .60 | Daewoo Heavy Industries | 2525-2544 | 1996 | 20+40 | 298 | 120 | Second batch, wide body. |
Question:
what are the number of times tokyu is listed as a manufacturer on this chart?
Answer:
2