annual increasing insurance costs - What does everyone do?

[Todd Aaron]

So, when I was doing my research before making purchases I allowed for all the costs involved, however each year my insurance rates climb a little higher even though I have made no claims.  If you push this out for decades, the cash flow eventually dwindles... I don't recall seeing this issue discussed in the books about this when I was getting started.  What does everyone do to combat this?  
Do you have to just shop insurance annually?
The increases are happening at a rate that is too high for me to equalize through rent increases. 
Thanks, Todd.