Gorbachev's ascent to power in the Soviet Union in 1985 and the events that followed appear to have led to a dramatic decline in philosophers' interest in Marxist philosophy. The magnitudes of philosophical literature on Marx, Engels, Lenin, and Hegel recorded in annual volumes ofThe Philosopher's Index have all been shrinking in recent years. In the 1992 volume, the share of the publications on Marx within all philosophical publications has dropped to almost one-third of what it was on average in the 1981–1985 volumes, on Engels and Lenin to about one-fifth, and on Hegel to about two-thirds.