Locating death penalty data for the 1950's and 1960's involves more steps than locating death penalty data for the 1990's.
You're searching for statistics re: the number of executions, NOT the number of inmates on death row.
Often, statistical data is NOT available neatly organized by decade and state/country.
Consider searching for various terms, such as "capital punishment", "death row", "death penalty", and/or executions.
Ctrl-F is your friend! This handy keyboard shortcut allows you to search for a word or phrase within a webpage or document. "Control + F" (clicking on the "Ctrl" key and "F" key on your keyboard) allows you to search for your keyword (for example, try opening a PDF, then clicking Ctrl-F to bring up a search box, then type in a word or phrase like capital punishment to see if that phrase appears anywhere in the document you're looking at).
If you are having a hard time finding death penalty statistics for a particular country, DO NOT ABANDON your country and pick another one - use this as inspiration to look into WHY this country's information may be so hard to find (its history, regional conflicts, etc.). This may ultimately be more interesting than finding & reporting a number.
Document where you are finding your information!
Use this selection of resources to find the data you need to successfully complete your assignment. This is not a comprehensive list, but just a sampling of vetted sources related to your topic.
Amnesty International is a global movement of more than 3 million supporters, members and activists in over 150 countries and territories who campaign to end grave abuses of human rights. Amnesty International opposes the death penalty in all cases and under all circumstances. The organization works for an end to executions and the abolition of the death penalty everywhere.
DPW's intention is to fill a void in current information about the laws and practices relating to the application of the death penalty around the world.
"There is a great deal of conflicting information about the death penalty, and at times it is difficult to gauge the accuracy of reports one is able to find by searching the web. Although there are many excellent online sources of information relating to death penalty practices around the world—most notably, reports generated by Amnesty International and the database maintained by Hands Off Cain—none of these are devoted to academic and legal analysis of developments in this field. This resource is not intended to supplant those resources, but to supplement them."
The Sourcebook provides data on the criminal justice system; public opinion on criminal justice issues; crime and victims; arrests and seizures; courts, prosecutions and sentencing; parole, jails, prisons, and the death penalty
An annual publication in which the FBI compiles volume and rate of crime offenses for the nation, the states, and individual agencies. This report also includes arrest, clearance, and law enforcement employee data.