ATLANTA (UPI) -- The number of AIDS cases has topped the 200,000 mark in the United States, with a 44 percent increase in the number of infections among heterosexuals, the federal Centers for Disease Control reported. The first 100,000 cases of AIDS were recorded over an eight-year period beginning in 1981 but the second 100,000 occurred in just two years, with 206,392 cases on record by Dec. 31, 1991, and 133,232 deaths, the CDC said Thursday. ``The cumulative total of more than 200,000 reported AIDS cases emphasizes the rapidly increasing magnitude of the HIV epidemic in the United States,'' said Dr. Larry Slutsker, a CDC epidemiologist. In comparing the characteristics of the first 100,000 cases to the second 100,000, the CDC said the percentage attributed to heterosexual transmission increased from 5 percent to 7 percent -- a 44 percent increase and most of it among women. ``Of all AIDS cases among women, 34 percent were attributed to heterosexual transmission, and women accounted for 61 percent of all cases attributed to heterosexual transmission,'' Slutsker said. Of the first 100,000 people with AIDS, 9 percent were women. That percentage increased to 12 percent in the second 100,000 victims. ``More and more cases are being attributed to heterosexual exposure,'' said Slutsker. Heterosexual people increase their risk for acquiring the AIDS virus when they have multiple sex partners or have unprotected sex, he said. Slutsker said a recent analysis of expected trends in AIDS cases in the United States suggests that by 1995 the infection rate among nondrug-using heterosexual men and women will double. Although the proportion of heterosexual AIDS cases continues to be ``minimal'' compared to those among high-risk groups -- homosexual and bisexual men and intravenous drug users -- the increase is of concern to public health officials, Slutsker said, and ``points out the need for increasing education and prevention efforts.'' The number of children with AIDS continued to increase. The first 100,000 people with AIDS included 1,683 children, of whom 81 percent were born to mothers with or at risk of HIV infection. The second 100, 000 people with AIDS included 1,702 children, 87 percent born to mothers with or at risk of the disease. Blacks and Hispanics accounted for a disproportionate number of the AIDS cases, both in the early years of the epidemic and in the last two years. Of the first 100,000 cases, 27 percent occurred among blacks and 15 percent among Hispanics. Of the second 100,000 cases, the percentages increased to 31 percent and 17 percent respectively, the CDC said. ``Of the estimated 1 million HIV-infected people in the U.S., approximately 20 percent have developed AIDS,'' the agency said. The only decline in AIDS transmission occurred in people receiving blood transfusions. The percentage of those cases dropped from 2.5 percent to 1.9 percent in adults and from 11 percent to 5.6 percent in children.