of the 621 people known to have come down with whooping cough in San Diego county, the vast majority (85 percent) were up to date on their immunizations.
Here's the problem with that statistic: If 90% of the people in San Diego county are up to date on their vaccinations, and the per capita of individuals was equal, then you'd end up with about 63 of the 621(or 90%) of whooping cough individuals as having their vaccinations. To truly see how well the whooping cough vaccination is working, you need to compare it to the percentage of total vaccinations. If the % is higher than the vaccinations total, you've got a problem, otherwise we can continue to blame un-vaccinated individuals as the problem.
In addition to what spire3661 said, I've not increased the amount of water I'm using because there aren't new ways to use it as there were when the pipes were installed. Even if I added a hot tub or a pool, that would only significantly increase my water usage 1x, then it would go back to levels near what I was at before.
The same cannot be said about our internet usage. New applications have continuously come out that have increased our appetite for data. When I 1st got on the internet, 56k dial up was more than adequate for anything available. Later when I started college, 1.5Mbps was far faster than anything available at the time, and so provided speeds that were generally unnecessary for all but pirating movies. Now, anything less than about 15Mbps won't cut it. And to get that, even in a large city, you are going to pay almost $100/month.
"History is a tool used by politicians to justify their intentions." -- Ted Koppel