Another great way to learn of the actual declination in your area is to get an aviation map - a "sectional." Those charts expire every 6 months so you may be able to get a free one at the small airport or from a pilot friend.

It would have the current (within 6 months) figure.

Indeed the USGS figures can't be right as many of the maps, at least the ones I look at, haven't been updated since 1960.