an old business professor of mine from college, who took a company public at one point, taught us that "if you're not growing, you're dying". the same mantra is now repeated here in silicon valley in the form of "move fast and break things" and "grow as fast as possible",etc.

regarding your spreadsheet, it doesn't take into account seasonality. factors such as weather and tourist activity certainly affect revenue.

if you take the total revenue in months Jan-June 2015 and compare them to the same time period in 2014, the delta is -8%. if you look at the last datapoint and compare to the first, you get a drop of 1%.