One possible model might be a Gompertz curve with a small additional constant exponential growth term, , which would have the property that the small term would be "uncovered" only in the latter stages of the Gompertz growth curve, because it would be dominated by the term.
I, the copyright holder of this work, hereby publish it under the following licenses:
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|as per en:File:2012 Wikipedia article count Gompertz fit.png, but with a small constant exponential growth term added}} |Source = Made with GIMP and OpenOffice from data g...