Complete the following sentence: Before 2011 there have been some complete subway closures for transit strikes (January 1<unk>13, 1966, April 1<unk>11, 1980, December 20<unk>22, 2005) and blackouts (November 9<unk>10, 1965, July 13<unk>14, 1977,
16 August 2003).