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:
| Year | Company | Number of Members Affected | Duration of Strike | Notes |
| --- | --- | --- | --- | --- |
| 1955 | Southern Bell Telephone Co. | 50,000 | 72 days | Strike was in answer to management's effort to prohibit workers from striking. |
| 1968 | AT&T | 200,000 | 18 days | Wage increases to compensate for cost of living, and medical benefits won |
| 1971 | Bell System | 400,000 | 1 week | Cost of Living Allowance (COLA) won for workers |
| 1983 | Bell System | 600,000 | 22 days | Last contract with the Bell System before its breakup. Bell System sought givebacks. The contract resulted in Wage increases, employment security, pension, and health improvements. |
| 1986 | AT&T | 175,000 | 25 days | COLA clause suspended in contract - former Bell System contracts vary substantially from the AT&T contract. |
| 1989 | AT&T | 175,000 | n/a | Child and elder care benefits added to contract. COLA clause removed from contract |
| 1989 | NYNEX | 175,000 | 17 weeks | Strike was due to major health care cuts by NYNEX |
| 1998 | US West | 34,000 | 15 day | Strike was due to mandatory overtime demands and forced pay-for-performance plan. Overtime caps were won. |
| 2000 | Verizon | 80,000 | 3 weeks | Strike was due to mandatory overtime demands. Provisions for stress were won. |
| 2011 | Verizon | 45,000 | 13 days | Strike was due to major wage and health care cuts by Verizon, a forced pay-for-performance plan and movement-of-work job security provisions. Contract extended. |
| 2012 | AT&T | 20,000 | 2 Days | AT&T West; California, Nevada, and AT&T East; Connecticut - Unfair labor practice strike during contract negotiations. |
Question:
at & t had consectutive strikes on the data table in what years
Answer:
1986, 1989