All data is from infoshare.
The population of Williamsburg has been increasing throughout the decades, as recorded on the census. This is logical because new housing units are being built or planned. The old warehouses and factories have been converted to residential areas in the decades, whether illegally, the rezoning, or other programs. More people are moving in, and the close proximity to Manhattan and the newly built homes make the area more appealing. The people that are forced out of Williamsburg from high rent are eventually replaced by the higher income people that move in.
In 1980, Hispanics made up 50% of the population in Williamsburg. It increased to 55.1% in 1990, but decreased to 47.5% in 2000 and 33.2% in 2010. The white population had been around 35% until 2010 when it became 54.3%, the majority. This is likely because of the rezoning attracting many whites. The census data for 2010 used the long form, and the short form results are only slightly different. The demographic change shows how much the neighborhood has changed, in some areas more than others.
The household income graph represents the gentrification of Williamsburg. More high income people are moving in, and the percentage of lower income people are decreasing. From 1989 to 2009, the percentage of people whose income is 50,000 or lower has decreased about 25%. Since the rent in Williamsburg is one of the highest of New York City, it is natural that there are more higher income people that live, since they need to have higher income than previous years or decades to keep up with the higher rent.