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:
| Rank | Circuit | Headquarters | Screens | Sites |
| --- | --- | --- | --- | --- |
| 1 | Regal Entertainment Group | Knoxville,TN | 7,318 | 574 |
| 2 | AMC Entertainment Inc | Kansas City, MO | 4,988 | 344 |
| 3 | Cinemark Theatres | Plano, TX | 4,434 | 332 |
| 4 | Carmike Cinemas, Inc. | Columbus, GA | 2,476 | 249 |
| 5 | Cineplex Entertainment | Toronto, ON | 1,672 | 136 |
| 6 | Marcus Theatres | Milwaukee, WI | 687 | 55 |
| 7 | Harkins Theatres | Phoenix, AZ | 440 | 31 |
| 8 | National Amusements | Dedham, MA | 423 | 32 |
| 9 | Bow Tie Cinemas | Ridgefield, CT | 388 | 63 |
| 10 | Georgia Theatre Company | St. Simon's Island, GA | 326 | 32 |
Question:
how many circuits have at least 2,000 screens?
Answer:
4