Persistence and Availability of Web Services in Computational Biology
There is a clear exception for services in the 2003 issue, visible in the number of runs per month: These services are still heavily used and have amassed a very high visitor and run total. 157 of 274 respondents (57%) answered the question about monthly data and 137 (50%) also stated total estimates. The blue, diamond-shaped symbols illustrate how newer services usually have a higher number of monthly visits, declining over time as the services become used less frequently. With the exception of the 2008 average, visitors also seem to use services more than once per visit. This is reflected both in the monthly and in the total numbers.