Sales of existing homes fell further in October even as more homes came on the market, driving the supply of homes to the highest level in 22 years, the National Association of Realtors reported Wednesday. Sales dropped 1.2% to a 4.97 million seasonally adjusted annualized pace in October, the real estate advocacy group said. The sales pace is the lowest since 1999. The inventory of unsold homes rose by 1.9% to 4.45 million, representing a 10.8 month supply, the highest since 1999. For single-family homes alone, the inventory of 10.5 months is the highest since July 1985.