I found a web page size article on the following:-
Website Optimization
WebSiteOptimization.com... some more description follows
Average Web Page Size Septuples Since 2003
Summary: Within the last eight years, the size of the average web page has more than septupled, and the number of external objects has more than tripled. While broadband users have experienced somewhat faster response times, dial-up users have been left behind.
The size of the average web page of the top 1000 websites has more than septupled since 2003.(our last update in July 2009 found it more than quintupled) From 2003 to 2011 the average web page grew from 93.7K to over 679K (see Figure 1), over 7.2 times larger (Domenech et al. 2007, Flinn & Betcher 2008, Charzinsk 2010, Souders 2011). During the same eight-year period, the number of objects in the average web page more than tripled from 25.7 to 85 objects per page. Longer term statistics show that since 1995 the size of the average web page has increased by 48 times, and the number of objects per page has grown by nearly 37 times.
There is lot of info, charts and data compilations shown there... See if that is useful to you. I hope you get your answer.
Best wishes