The graphs to the left replicate diagrams in the 2011 Annual Report of Oslo University Library. The first two show changes in absolute numbers (variables) over time. The third compares two series of percentages.
The diagrams to the right are suggested alternatives. The first two show changes in relative numbers (indicators) over time. These values can easily be compared with other HE institutions. The third also compares percentage changes year by year (bar chart), but also shows the cumulative effect of these changes (line chart).