History of Jobs

Via a couple sites (Marginal Revolution and others), here's an interactive graphic showing change of jobs over the last 150 years. (Launch the full screen version for best readability.)  Some interesting trends: farming down, clerical up, etc.  But who would have known the proportion of the labor force serving as waitresses would have dropped from 1960 to 2000?  Or that clergymen would have maintained their proportion over the years?