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[jimmy the one]

56. both rose again

From 2000 which was 64% to 2011 at 69% despite gun ownership remaining stable. So why is the proportion of firearm homicides over all homicides increasing if ownership remained stable? The average for 1993-1998 (period of decline) was 69%.

Gun ownership was not totally stable, it rose about 10% the years you note, accd'g to gallup, & kinda by gss:
Accd'g to Gallup*, HH gun ownership rose from 2000 to ~2011, approx. 34% to ~40%, and personal gun ownership going from ~27% to 29% spiking to 33% 2011/12;
GSS has gun ownership remaining stable with a slight decline 35 -34 and 23 - 22, but caveats that HH pistols & shotguns rose from ~9% to ~18% 2003 to 2011, inferring that rifle ownership declined those very years (graph, your post 53). A rise in handgun ownership would be a correlation to higher murder rates.

* (tho I discount somewhat gallup as leaning republican this century);