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Productivity is total coal production divided by total employee hours for the same reported quarters; it is null when the measures cover different quarters or hours are zero. Missing reports are null, not zero. Portfolio membership is current, not historical."},"window":{"period":"latest-8","label":"2025-01-01 – 2026-10-18","start":"2025-01-01","end":"2026-10-18","quarters":["2025-Q1","2025-Q2","2025-Q3","2025-Q4","2026-Q1","2026-Q2","2026-Q3","2026-Q4"],"options":[{"value":"latest-8","label":"Last 8 quarters · through snapshot"},{"value":"latest-4","label":"Last 4 quarters · through snapshot"},{"value":"3y","label":"Last 12 quarters"},{"value":"4y","label":"Last 16 quarters"},{"value":"5y","label":"Last 20 quarters"},{"value":"10y","label":"Last 40 quarters"},{"value":"all","label":"All available years · since 1994"},{"value":"2026","label":"2026"},{"value":"2025","label":"2025"},{"value":"2024","label":"2024"},{"value":"2023","label":"2023"},{"value":"2022","label":"2022"},{"value":"2021","label":"2021"},{"value":"2020","label":"2020"},{"value":"2019","label":"2019"},{"value":"2018","label":"2018"},{"value":"2017","label":"2017"},{"value":"2016","label":"2016"},{"value":"2015","label":"2015"},{"value":"2014","label":"2014"},{"value":"2013","label":"2013"},{"value":"2012","label":"2012"},{"value":"2011","label":"2011"},{"value":"2010","label":"2010"},{"value":"2009","label":"2009"},{"value":"2008","label":"2008"},{"value":"2007","label":"2007"},{"value":"2006","label":"2006"},{"value":"2005","label":"2005"},{"value":"2004","label":"2004"},{"value":"2003","label":"2003"},{"value":"2002","label":"2002"},{"value":"2001","label":"2001"},{"value":"2000","label":"2000"},{"value":"1999","label":"1999"},{"value":"1998","label":"1998"},{"value":"1997","label":"1997"},{"value":"1996","label":"1996"},{"value":"1995","label":"1995"},{"value":"1994","label":"1994"}]},"mineMetrics":[{"mineId":"4102840","production":2115235,"hours":561106,"reportingQuarters":6,"expectedQuarters":8}]}