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A3 Explanatory notes to tables, figures
and statistics
1 Explanatory notes to tables
This report contains a number of tables. Several remarks that are of importance when interpreting these
tables are given below. As a result of numbers being rounded off, the sub-percentages in the tables do
not always add up to 100%. Of course, the total does really amount to 100% and is therefore also listed
accordingly. If numbers are displayed in a column of a table, the letter ‘N’ (for ‘number’) is used in the
header of the corresponding table. If a ranking is given in a column of a table, the letter ‘R’ (for rank) is
used in the header of the corresponding table. In the tables, a dash (-) is used to indicate that the number
is zero, and likewise to indicate that the corresponding percentage is 0%. If the number is higher than
zero, but the percentage ends up at 0% after rounding off, 0% is displayed instead of a hyphen.
2 Explanatory notes to figures
This report contains a number of tables that are based on the supplementary tables from Appendix 4.
Several remarks that are of importance when interpreting these figures are given below. If a development
is represented in absolute terms (numbers), a line graph is used. If multiple lines are displayed on
one graph, this represents developments that can be compared against each other. If a development is
represented in relative terms (proportions), a histogram is used. If an overview (over a certain period in
time) is represented, a pie chart is used.
3 Explanatory notes to statistics
Some tables provide an index figure. The index figure is used to show the degree to which the number –
of suspects for example – has changed in a certain year in relation to a base year. The year that has been
taken as a base year is stated in the header of the table. This year is set to 1.0. An index figure greater than
1.0 displays an increase in relation to the base year, and an index figure lower than 1.0 displays a decrease.