We held a workshop in partnership with Munich Re on exactly this graph that Pier Vellinga has shown. The purpose of the workshop was to explain why we see the increasing damage trend due to storms and floods.

You can see the report here:

http://sciencepolicy.colorado.edu/sparc/research/projects/extreme_events/munich_workshop/workshop_report.html

It was cited in the IPCC AR4. Some key findings relevant to your blog post include:

“8. Analyses of long-term records of disaster losses indicate that societal change and economic development are the principal factors responsible for the documented increasing losses to date.

11. Because of issues related to data quality, the stochastic nature of extreme event impacts, length of time series, and various societal factors present in the disaster loss record, it is still not possible to determine the portion of the increase in damages that might be attributed to climate change due to GHG emissions

13. In the near future the quantitative link (attribution) of trends in storm and flood losses to climate changes related to GHG emissions is unlikely to be answered unequivocally.”

http://sciencepolicy.colorado.edu/sparc/research/projects/extreme_events/munich_workshop/executive_summary.pdf

Is that the most appropriate graph or do you have a better suggestion?

see http://www.volkskrantblog.nl/bericht/237382