Several databases are used to ensure a comprehensive database of the public capital stock series covering the period 1860-2014. Country data now replace certain aggregates (such as oil exporters and Caribbean banking centers) previously used in data on holdings of Treasury securities.We work in more than 100 countries, using our capital, expertise, and influence to create markets and opportunities in developing countries. State lawmakers knew the capital gains tax would be an unpredictable revenue source, prone to up and down swings. Washington's requirements include: Officers. Certain qualified familyowned small business sales. Depreciable assets used in a trade or business. Box 15g is optional. Washington State's Capital Gains Tax.