"Historically, the number of homicides increased from around 300 per year in the early 1960s to over 800 per year in the early years of this century, which was at a faster rate than population growth over the same period. However, to the year ending March 2015, the volume of homicides has generally decreased while the population of England and Wales has continued to grow.
Figure 1 shows that in the latest two years, the number of homicides has begun to increase, but the homicide rate for the year ending March 2017 was still 20% lower than 10 years ago (13.2 homicides per million population compared with 10.5 homicides per million population – excluding Hillsborough)."
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"Compared with other offences, homicides are relatively low-volume and year-on-year variations need to be interpreted with some caution. However, a statistical analysis of trends2 shows the number of homicide incidents recorded in the year ending March 2017 was not statistically significantly different at the 95% level compared with the previous year, but was significantly higher compared with the year ending March 2015"
Homicide in England and Wales - Office for National Statistics
Though there was a significant spike after weapon legislation, the past decade has shown a gradual decrease toward mid 1970's levels with an uptick over the past two years. As I stated previously this bump (refer to previously cited Excel) can be attributed to the Hillsborough incident.
However, I am wrong because I clearly stated when compared to rates 20 years ago.
This is just not the case. Your argument may be different.