Table 1 Number of data points.

Variable	Available period	Raw data^a,b		Final data^b
Variable	Available period	Yield	Area	Yield	Area
Spring barley	1979–2021	16,306	6,219	14,083	3,983
Winter barley	1979–2021	17,267	6,689	14,977	4,120
Grain maize	1979–2021	9,285	3,576	9,095	3,200
Silage maize	1979–2021	16,625	6,306	14,467	4,090
Oats	1979–2021	15,672	6,174	13,757	3,965
Potatoes	1979–2021	12,274	6,080	13,363	3,884
Winter rape	1979–2021	15,459	5,073	13,664	3,580
Rye	1979–2021	15,809	6,046	13,761	3,921
Sugarbeet	1979–2021	13,476	5,158	11,664	3,288
Triticale	1999–2021	6,737	2,271	6,470	2,048
Winter wheat	1979–2021	17,538	6,628	15,233	4,095
Arable land	1979–2021	n.a.	10,532	n.a.	17,056
District area	1979–2021	n.a.	15,065	n.a.	17,056
Total		156,448	85,817	140,534	74,286
Total yield and area data		242,265		214,820

Notes: a) The ‘Raw data’ columns show data prior to spatial district harmonization, outlier filtering and arable area imputations. b) Missing data points (44,995 in total) are not counted.

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