When did Christmas day last fall on a Saturday?

Since 1900, Christmas has been on Saturday these years:

1909, 1915, 1920, 1926,

1937, 1943, 1948, 1954,

1965, 1971, 1976, 1982,

1993, 1999, 2004, 2010

The pattern is 6-5-6-11 years between occurrences, and of course, New Year's Day follows the same pattern... so bankers rejoice! We won't be robbed of two Federal holidays again until 2021!