Topps dominated the baseball card market until 1981, when a federal court antitrust decision broke their stranglehold, leading to an explosion of competition. By the late 1980s, new card varieties developed a speculative market, with consumers flooding the market with cash seeking to buy card as investments. The market bubble grew until 1991, when sport card sales topped $1.2 billion, then burst, settling to annual sales of $300 million by 2004. In reesponse, card makers have struggled to regain market share with new products and sets, such as cards with pieces of bats or game-worn uniforms affixed to them. In 2003, four separate card companies released 87 separate sets of cards. In addition to these new sets is a $500 five-card pack of basketball cards released by the Upper Deck Company in 2004, which eclipsed the previous industry-high price of $150.