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:
| Manufacturer | Model | Intro Date | Interface | OS | Price (USD) | Price | Throughput |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Simtec Electronics | Entropy Key | 2009 | USB | Windows/Linux/BSD | 60.0 | £36 | 32 kbit/s |
| ID Quantique SA | Quantis-USB | 2006 | USB | Windows/Linux | 1310.0 | 990€ | 4 Mbit/s |
| ID Quantique SA | Quantis-PCI-4 | 2006 | PCI | Windows/Linux | 2952.0 | 2,230€ | 16 Mbit/s |
| Comscire | PQ4000KU | 2013 | USB | Linux/Windows/Mac | 895.0 | 686€ | 4 Mbit/s |
| Comscire | PQ32MU | 2013 | USB | Linux/Windows/Mac | 1495.0 | 1,139€ | 32 Mbit/s |
| LETech | GRANG | 2008-2012 | PCI/USB3/SATA | Linux/Windows | 6800.0 | 5,500€ | 400 Mbit/s |
| TRNG98 | TRNG9803 | 2009 | SERIAL | Linux/Windows/Solaris/BSD | 230.0 | 179€ | 72 kbit/s |
Question:
How many intro dates have the price of 686€?
Answer:
1.0