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:
| Years | Building | City | Height (CTBUH) | Floors |
| --- | --- | --- | --- | --- |
| 1975–present | First Canadian Place | Toronto | 298.1 m (978 ft)\n(355 m (1,165 ft) tip) | 72 |
| 1972-1975 | Commerce Court West | Toronto | 239.0 m (784 ft)\n(287.0 m (942 ft) tip) | 57 |
| 1967-1972 | Toronto-Dominion Centre | Toronto | 222.8 m (731 ft) | 56 |
| 1964-1967 | Tour de la Bourse | Montreal | 190.0 m (623 ft) | 47 |
| 1962-1964 | Place Ville-Marie | Montreal | 188.0 m (617 ft) | 44 |
| 1962 | Tour CIBC | Montreal | 184.0 m (604 ft)\n(225.6 m (740 ft) tip) | 45 |
| 1931-1962 | Commerce Court North | Toronto | 145.0 m (476 ft) | 34 |
Question:
how many tallest building in canada have been built in toronto?
Answer:
4