Careful cherry picking of monthly data makes these kinds of scary numbers possible. Chicago had an above average number of murders in 2020, but that came after three years of declining numbers. If you put them on a trend line, it's not all that far out of the range. You get the occasional high year and the occasional low year. But by and large, since McDonald v. Chicago, the murder rate hasn't changed much. If anything, the loosening of gun laws in Chicago has correlated with more murders.
But like I said before, gun laws seem to have little effect because we don't actually restrict guns all that heavily. Even if we were to toss out the 2A and start enacting bans, it would likely take 30-50 years to see a substantial number of guns removed from circulation; enough to affect the frequency of their use in a homicide.
You can pick your law enforcement agency and which crimes go on their graph at the bottom. Handy little tool actually.
https://crime-data-explorer.app.cloud.gov/pages/explorer/crime/crime-trend
Nope. Can't claim any such trend for Chicago. They're all over the place.
At best, you can say those three preceding years were a drop from a previous peak in 2016. They're close to the numbers from 2012 to 2015.
2021: 2,791 shot; 2,314 wounded; 477 killed. (Total homicides, 503)
2020: 4 174 shot; 3,455 wounded; 719 killed. (Total homicides, 792)
2019: 2,754 shot; 2,292 wounded; 463 killed. (Total homicides, 519)
2018: 2,962 shot; 2,465 wounded; 497 killed. (Total homicides, 592)
2017: 3,561 shot; 2,935 wounded; 626 killed. (Total homicides, 685)
2016: 4,380 shot; 3,658 wounded; 722 killed. (Total homicides, 808)
2015: 2,996 shot; 2,546 wounded; 450 killed. (Total homicides, 513)
2014: 2,621 shot; 2,230 wounded; 321 killed. (Total homicides, 464)
2013: 2,185 shot; 1,810 wounded; 375 killed. (Total homicides, 455)
2012: 441 killed. (Total homicides, 514)
(I pulled this data from heyjackass dot com. Any transcription errors are mine. 2021 data current as of this posting.)