Final answer:
The provided references do not contain the necessary data to calculate the percentage of offenses between 1968 and 2000. This calculation would typically involve summing offenses for each year and dividing by the total offenses for the period, then multiplying by 100 to get a percentage.
Step-by-step explanation:
The student's question asks for the percentage of offenses between 1968 to 2000. However, the information provided in the references does not give a specific percentage of offenses between those years. To answer this question accurately, we would typically need a dataset that includes the number of offenses for each year between 1968 and 2000, and potentially the population data for those years to calculate rates per 100,000 inhabitants.
Nevertheless, we have statistical data, such as the data set listed for the city of Detroit, Michigan, from 1961 to 1973, and a note regarding crime rates and education from the FBI's Uniform Crime Report in 1960. However, none of these provide a straightforward calculation of the percentage of offenses between 1968 to 2000.
If offense data for each relevant year was available, you would calculate the percentage of offenses by taking the number of offenses for each year, summing them up, and dividing by the total offenses recorded over that time span. To express it as a percentage, you would then multiply the result by 100.