This is true... all the major underwiters sought and in most cases filed rate increases or received permission to increase rates depending on state regulations in most states as the housing bust occurred and transaction volume dried up.  What that would mean in isolation is that the title premium graphs understate the extent to which volume of title business dried up in terms of the number of policies issued.  This would be important for, say, abstractors, who might get the same fee or a similar fee per search as opposed to being paid an amount based on the sale price of properties.

One thing to note about that however is that at the same time premiums were being raised, home prices were falling roughly 30% on average nationwide.  This is also reflected in the premium graphs, and would counterbalance the effect of premium increases in those graphs.  In other words, while insurers were able to increase rates, they still might have only gotten the about same amount of premium on average per policy as before, because home values had fallen by a similar amount to the rate increase.