Although the previous answers are great, you may be in a unique situation. As you may already know, Tacoma has several non-conforming neighborhoods with their own micro-markets. Specifically, I'm referring to such areas as the Old Town, Stadium, Prospect Hill, etc. neighborhoods. Although they are not immune from market conditions, due to their history, location, and high income residents, homes in these certain areas may retain their value several times longer than surrounding neighborhoods, and typically rebound faster and higher from dips.
You probably live in such a neighborhood. You may have noticed, there are rarely, if ever, short sales or foreclosures. Residents there usually have the means to make monthly payments, or own the homes outright, many times as second or even third generations. Therefore, there is a general pride of ownership and community, which makes the neighborhood very desirable even in down markets.
I think you may get a good feeling for the value of your home if you take a weekend drive or walk through neighborhoods similar to yours and see what the homes are selling for and what the homeowners are doing with remodeling and landscaping. Although reading market statistics is a good way to monitor a general area, it may not precisely reflect specific streets or neighborhoods.