There’s a terrible amount more information you’re missing here. What services were you using that went down? (not what services went down, how were you affected) What is your availability for your DC? it seems you’re being light in the details and perhaps there’s a reason why.
2011 April 21 Outage
2011 August 8 Outage
2012 June 29 Service disruption
2012 October 22 Outage
2012 December 24 Outage
2013 September 13 Outage
2014 November 26 Service disruption
2015 September 20 Outage
2016 June 5 Outage
2017 February 28 Outage
2018 March 2 Service degradation
2018 May 31 Outage