In 1961, Icahn began his career as a stockbroker for Dreyfus Corporation. In 1963, he became an options manager for Tessel, Patrick & Co. and then he moved to Gruntal & Co.

In 1968, with $150,000 of his own money and a $400,000 investment from his uncle, M. Elliot Schnall, Icahn bought a seat on the New York Stock Exchange and formed Icahn & Co., which focused on risk arbitrage and options trading.

In 1978, in his first takeover attempt, he took a controlling stake in Tappan and forced the sale of the company to Electrolux, making a profit of $2.7 million, or doubling his investment. In 1979, he acquired Bayswater Realty & Capital Corporation. In 1983, he acquired ACF Industries and in 1985 he sold those shares to Phillips Petroleum, making a $50 million profit.In 1985, by pooling his funds with investor funds and funds borrowed from banks, Icahn acquired 50% of Trans World Airlines, and he completely acquired the company in a leveraged buyout in 1988. Icahn systematically sold TWA's assets to repay money he owed, which was described as "asset stripping" and made him known as a "corporate raider". In 1991, he sold TWA's London routes to American Airlines for $445 million. Icahn made a $469 million profit, and left TWA with $540 million in debt. He formed lowestfare.com to sell TWA tickets and acquired portions of Global Leisure Travel from Ramy El-Batrawi.

In October 1986, Icahn launched an unsuccessful $8 billion hostile takeover for 89% of U.S. Steel; the bid was dropped in January 1987. In 1991, he sold his stake in the company for $1 billion, making a $200 million profit.
From the passage identify the years in which major events happened in Icahn’s business career. Display the results in comma separated format.
1961, 1963,1968, 1978, 1983, 1985, 1986, 1988, 1987, 1991