Statistics: Proceedings of SPIE - The International Society for Optical Engineering

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Region	#
AS - Asia, other	55
NA - North America	8
EU - Europe	2
Unknown	7
Total	72

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Country	#
CN - China	55
US - United States of America	8
FR - France	1
RU - Russian Federation	1
Unknown	7
Total	72

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City	#
Zhengzhou	18
Beijing	12
Xinxiang	7
Luoyang	3
Des Moines	2
Songyang	2
Chongqing	1
Gulou	1
Inglewood	1
Las Vegas	1
other	24
Total	72

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	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Tot
2019	0	0	0	0	0	1	0	0	0	0	0	0	1
2020	1	0	0	0	0	0	0	0	0	0	0	0	1
2021	0	0	0	0	0	0	0	0	0	0	7	0	7
2022	0	3	0	2	11	3	9	4	0	0	0	1	33
2023	0	2	2	13	13	0	0	0	0	0	0	0	30
Ever													72