| Schedule of Disaggregated Revenue |
Revenue has been disaggregated into the following categories to show how economic factors affect the nature, amount, timing and uncertainty of revenue and cash flows: | | | | | | | | | | | | | | | | | | | Year Ended December 27, 2020 | | Domestic | | Export | | Net Sales | | (In thousands) | | U.S. | $ | 7,189,539 | | | $ | 306,478 | | | $ | 7,496,017 | | | U.K. and Europe | 2,976,878 | | | 297,414 | | | 3,274,292 | | | Mexico | 1,321,592 | | | — | | | 1,321,592 | | | Net sales | $ | 11,488,009 | | | $ | 603,892 | | | $ | 12,091,901 | |
| | | | | | | | | | | | | | | | | | | Year Ended December 29, 2019 | | Domestic | | Export | | Net Sales | | (In thousands) | | U.S. | $ | 7,353,925 | | | $ | 282,791 | | | $ | 7,636,716 | | | U.K. and Europe | 2,105,578 | | | 278,215 | | | 2,383,793 | | | Mexico | 1,388,710 | | | — | | | 1,388,710 | | | Net sales | $ | 10,848,213 | | | $ | 561,006 | | | $ | 11,409,219 | |
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| Changes in Revenue Contract Liability |
Changes in the revenue contract liability balances for the years ended December 27, 2020 and December 29, 2019 were as follows: | | | | | | | | | | | | | December 27, 2020 | | December 29, 2019 | | (In thousands) | | Balance, beginning of year | $ | 41,770 | | | $ | 33,328 | | | Revenue recognized | (32,816) | | | (57,074) | | | Cash received, excluding amounts recognized as revenue during the period | 56,964 | | | 65,516 | | | Balance, end of year | $ | 65,918 | | | $ | 41,770 | |
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