$ for file in *.count ; do echo -n "$file: " ; awk '{ sum += $1 } END { print sum }' $file ; done
2010.txt.count: 301
2011.txt.count: 2214
2012.txt.count: 1472
2013.txt.count: 916
2014.txt.count: 1015
2015.txt.count: 918
2016.txt.count: 661
2017.txt.count: 766
2018.txt.count: 791
2019.txt.count: 838
2020.txt.count: 1091
2021.txt.count: 986
2022.txt.count: 863
2023.txt.count: 579
2024.txt.count: 468